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-rw-r--r--0056-Backport-phiopt-Optimize-x-y-cmp-z-PR94589.patch1067
1 files changed, 1067 insertions, 0 deletions
diff --git a/0056-Backport-phiopt-Optimize-x-y-cmp-z-PR94589.patch b/0056-Backport-phiopt-Optimize-x-y-cmp-z-PR94589.patch
new file mode 100644
index 0000000..473dee8
--- /dev/null
+++ b/0056-Backport-phiopt-Optimize-x-y-cmp-z-PR94589.patch
@@ -0,0 +1,1067 @@
+From 02313ab8cf7eb4defc1482ece48c07c2d8c77be9 Mon Sep 17 00:00:00 2001
+From: Jakub Jelinek <jakub@redhat.com>
+Date: Thu, 6 May 2021 10:15:40 +0200
+Subject: [PATCH 08/35] [Backport] phiopt: Optimize (x <=> y) cmp z [PR94589]
+
+Reference: https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=ad96c867e173c1ebcfc201b201adac5095683a08
+
+genericize_spaceship genericizes i <=> j to approximately
+({ int c; if (i == j) c = 0; else if (i < j) c = -1; else c = 1; c; })
+for strong ordering and
+({ int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; c; })
+for partial ordering.
+The C++ standard supports then == or != comparisons of that against
+strong/partial ordering enums, or </<=/==/!=/>/>= comparisons of <=> result
+against literal 0.
+
+In some cases we already optimize that but in many cases we keep performing
+all the 2 or 3 comparisons, compute the spaceship value and then compare
+that.
+
+The following patch recognizes those patterns if the <=> operands are
+integral types or floating point (the latter only for -ffast-math) and
+optimizes it to the single comparison that is needed (plus adds debug stmts
+if needed for the spaceship result).
+
+There is one thing I'd like to address in a follow-up: the pr94589-2.C
+testcase should be matching just 12 times each, but runs
+into operator>=(partial_ordering, unspecified) being defined as
+(_M_value&1)==_M_value
+rather than _M_value>=0. When not honoring NaNs, the 2 case should be
+unreachable and so (_M_value&1)==_M_value is then equivalent to _M_value>=0,
+but is not a single use but two uses. I'll need to pattern match that case
+specially.
+
+2021-05-06 Jakub Jelinek <jakub@redhat.com>
+
+ PR tree-optimization/94589
+ * tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Call
+ spaceship_replacement.
+ (cond_only_block_p, spaceship_replacement): New functions.
+
+ * gcc.dg/pr94589-1.c: New test.
+ * gcc.dg/pr94589-2.c: New test.
+ * gcc.dg/pr94589-3.c: New test.
+ * gcc.dg/pr94589-4.c: New test.
+ * g++.dg/opt/pr94589-1.C: New test.
+ * g++.dg/opt/pr94589-2.C: New test.
+ * g++.dg/opt/pr94589-3.C: New test.
+ * g++.dg/opt/pr94589-4.C: New test.
+---
+ gcc/testsuite/g++.dg/opt/pr94589-1.C | 33 +++
+ gcc/testsuite/g++.dg/opt/pr94589-2.C | 33 +++
+ gcc/testsuite/g++.dg/opt/pr94589-3.C | 84 ++++++
+ gcc/testsuite/g++.dg/opt/pr94589-4.C | 84 ++++++
+ gcc/testsuite/gcc.dg/pr94589-1.c | 35 +++
+ gcc/testsuite/gcc.dg/pr94589-2.c | 35 +++
+ gcc/testsuite/gcc.dg/pr94589-3.c | 97 ++++++
+ gcc/testsuite/gcc.dg/pr94589-4.c | 97 ++++++
+ gcc/tree-ssa-phiopt.c | 424 +++++++++++++++++++++++++++
+ 9 files changed, 922 insertions(+)
+ create mode 100644 gcc/testsuite/g++.dg/opt/pr94589-1.C
+ create mode 100644 gcc/testsuite/g++.dg/opt/pr94589-2.C
+ create mode 100644 gcc/testsuite/g++.dg/opt/pr94589-3.C
+ create mode 100644 gcc/testsuite/g++.dg/opt/pr94589-4.C
+ create mode 100644 gcc/testsuite/gcc.dg/pr94589-1.c
+ create mode 100644 gcc/testsuite/gcc.dg/pr94589-2.c
+ create mode 100644 gcc/testsuite/gcc.dg/pr94589-3.c
+ create mode 100644 gcc/testsuite/gcc.dg/pr94589-4.c
+
+diff --git a/gcc/testsuite/g++.dg/opt/pr94589-1.C b/gcc/testsuite/g++.dg/opt/pr94589-1.C
+new file mode 100644
+index 000000000..d1cc5050c
+--- /dev/null
++++ b/gcc/testsuite/g++.dg/opt/pr94589-1.C
+@@ -0,0 +1,33 @@
++// PR tree-optimization/94589
++// { dg-do compile { target c++20 } }
++// { dg-options "-O2 -g0 -fdump-tree-optimized" }
++// { dg-final { scan-tree-dump-times "\[ij]_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[ij]_\[0-9]+\\(D\\)" 12 "optimized" } }
++// { dg-final { scan-tree-dump-times "i_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[45]" 12 "optimized" } }
++
++#include <compare>
++
++#define A __attribute__((noipa))
++A bool f1 (int i, int j) { auto c = i <=> j; return c == 0; }
++A bool f2 (int i, int j) { auto c = i <=> j; return c != 0; }
++A bool f3 (int i, int j) { auto c = i <=> j; return c > 0; }
++A bool f4 (int i, int j) { auto c = i <=> j; return c < 0; }
++A bool f5 (int i, int j) { auto c = i <=> j; return c >= 0; }
++A bool f6 (int i, int j) { auto c = i <=> j; return c <= 0; }
++A bool f7 (int i, int j) { auto c = i <=> j; return c == std::strong_ordering::less; }
++A bool f8 (int i, int j) { auto c = i <=> j; return c != std::strong_ordering::less; }
++A bool f9 (int i, int j) { auto c = i <=> j; return c == std::strong_ordering::equal; }
++A bool f10 (int i, int j) { auto c = i <=> j; return c != std::strong_ordering::equal; }
++A bool f11 (int i, int j) { auto c = i <=> j; return c == std::strong_ordering::greater; }
++A bool f12 (int i, int j) { auto c = i <=> j; return c != std::strong_ordering::greater; }
++A bool f13 (int i) { auto c = i <=> 5; return c == 0; }
++A bool f14 (int i) { auto c = i <=> 5; return c != 0; }
++A bool f15 (int i) { auto c = i <=> 5; return c > 0; }
++A bool f16 (int i) { auto c = i <=> 5; return c < 0; }
++A bool f17 (int i) { auto c = i <=> 5; return c >= 0; }
++A bool f18 (int i) { auto c = i <=> 5; return c <= 0; }
++A bool f19 (int i) { auto c = i <=> 5; return c == std::strong_ordering::less; }
++A bool f20 (int i) { auto c = i <=> 5; return c != std::strong_ordering::less; }
++A bool f21 (int i) { auto c = i <=> 5; return c == std::strong_ordering::equal; }
++A bool f22 (int i) { auto c = i <=> 5; return c != std::strong_ordering::equal; }
++A bool f23 (int i) { auto c = i <=> 5; return c == std::strong_ordering::greater; }
++A bool f24 (int i) { auto c = i <=> 5; return c != std::strong_ordering::greater; }
+diff --git a/gcc/testsuite/g++.dg/opt/pr94589-2.C b/gcc/testsuite/g++.dg/opt/pr94589-2.C
+new file mode 100644
+index 000000000..dda947e22
+--- /dev/null
++++ b/gcc/testsuite/g++.dg/opt/pr94589-2.C
+@@ -0,0 +1,33 @@
++// PR tree-optimization/94589
++// { dg-do compile { target c++20 } }
++// { dg-options "-O2 -g0 -ffast-math -fdump-tree-optimized" }
++// { dg-final { scan-tree-dump-times "\[ij]_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[ij]_\[0-9]+\\(D\\)" 14 "optimized" } }
++// { dg-final { scan-tree-dump-times "i_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) 5\\.0" 14 "optimized" } }
++
++#include <compare>
++
++#define A __attribute__((noipa))
++A bool f1 (double i, double j) { auto c = i <=> j; return c == 0; }
++A bool f2 (double i, double j) { auto c = i <=> j; return c != 0; }
++A bool f3 (double i, double j) { auto c = i <=> j; return c > 0; }
++A bool f4 (double i, double j) { auto c = i <=> j; return c < 0; }
++A bool f5 (double i, double j) { auto c = i <=> j; return c >= 0; }
++A bool f6 (double i, double j) { auto c = i <=> j; return c <= 0; }
++A bool f7 (double i, double j) { auto c = i <=> j; return c == std::partial_ordering::less; }
++A bool f8 (double i, double j) { auto c = i <=> j; return c != std::partial_ordering::less; }
++A bool f9 (double i, double j) { auto c = i <=> j; return c == std::partial_ordering::equivalent; }
++A bool f10 (double i, double j) { auto c = i <=> j; return c != std::partial_ordering::equivalent; }
++A bool f11 (double i, double j) { auto c = i <=> j; return c == std::partial_ordering::greater; }
++A bool f12 (double i, double j) { auto c = i <=> j; return c != std::partial_ordering::greater; }
++A bool f13 (double i) { auto c = i <=> 5.0; return c == 0; }
++A bool f14 (double i) { auto c = i <=> 5.0; return c != 0; }
++A bool f15 (double i) { auto c = i <=> 5.0; return c > 0; }
++A bool f16 (double i) { auto c = i <=> 5.0; return c < 0; }
++A bool f17 (double i) { auto c = i <=> 5.0; return c >= 0; }
++A bool f18 (double i) { auto c = i <=> 5.0; return c <= 0; }
++A bool f19 (double i) { auto c = i <=> 5.0; return c == std::partial_ordering::less; }
++A bool f20 (double i) { auto c = i <=> 5.0; return c != std::partial_ordering::less; }
++A bool f21 (double i) { auto c = i <=> 5.0; return c == std::partial_ordering::equivalent; }
++A bool f22 (double i) { auto c = i <=> 5.0; return c != std::partial_ordering::equivalent; }
++A bool f23 (double i) { auto c = i <=> 5.0; return c == std::partial_ordering::greater; }
++A bool f24 (double i) { auto c = i <=> 5.0; return c != std::partial_ordering::greater; }
+diff --git a/gcc/testsuite/g++.dg/opt/pr94589-3.C b/gcc/testsuite/g++.dg/opt/pr94589-3.C
+new file mode 100644
+index 000000000..725b81f56
+--- /dev/null
++++ b/gcc/testsuite/g++.dg/opt/pr94589-3.C
+@@ -0,0 +1,84 @@
++// { dg-do run { target c++20 } }
++// { dg-options "-O2 -g" }
++
++#include "pr94589-1.C"
++
++#define C(fn, i, j, r) if (fn (i, j) != r) __builtin_abort ()
++#define D(fn, i, r) if (fn (i) != r) __builtin_abort ()
++
++int
++main ()
++{
++ C (f1, 7, 8, false);
++ C (f1, 8, 8, true);
++ C (f1, 9, 8, false);
++ C (f2, 7, 8, true);
++ C (f2, 8, 8, false);
++ C (f2, 9, 8, true);
++ C (f3, 7, 8, false);
++ C (f3, 8, 8, false);
++ C (f3, 9, 8, true);
++ C (f4, 7, 8, true);
++ C (f4, 8, 8, false);
++ C (f4, 9, 8, false);
++ C (f5, 7, 8, false);
++ C (f5, 8, 8, true);
++ C (f5, 9, 8, true);
++ C (f6, 7, 8, true);
++ C (f6, 8, 8, true);
++ C (f6, 9, 8, false);
++ C (f7, 7, 8, true);
++ C (f7, 8, 8, false);
++ C (f7, 9, 8, false);
++ C (f8, 7, 8, false);
++ C (f8, 8, 8, true);
++ C (f8, 9, 8, true);
++ C (f9, 7, 8, false);
++ C (f9, 8, 8, true);
++ C (f9, 9, 8, false);
++ C (f10, 7, 8, true);
++ C (f10, 8, 8, false);
++ C (f10, 9, 8, true);
++ C (f11, 7, 8, false);
++ C (f11, 8, 8, false);
++ C (f11, 9, 8, true);
++ C (f12, 7, 8, true);
++ C (f12, 8, 8, true);
++ C (f12, 9, 8, false);
++ D (f13, 4, false);
++ D (f13, 5, true);
++ D (f13, 6, false);
++ D (f14, 4, true);
++ D (f14, 5, false);
++ D (f14, 6, true);
++ D (f15, 4, false);
++ D (f15, 5, false);
++ D (f15, 6, true);
++ D (f16, 4, true);
++ D (f16, 5, false);
++ D (f16, 6, false);
++ D (f17, 4, false);
++ D (f17, 5, true);
++ D (f17, 6, true);
++ D (f18, 4, true);
++ D (f18, 5, true);
++ D (f18, 6, false);
++ D (f19, 4, true);
++ D (f19, 5, false);
++ D (f19, 6, false);
++ D (f20, 4, false);
++ D (f20, 5, true);
++ D (f20, 6, true);
++ D (f21, 4, false);
++ D (f21, 5, true);
++ D (f21, 6, false);
++ D (f22, 4, true);
++ D (f22, 5, false);
++ D (f22, 6, true);
++ D (f23, 4, false);
++ D (f23, 5, false);
++ D (f23, 6, true);
++ D (f24, 4, true);
++ D (f24, 5, true);
++ D (f24, 6, false);
++}
+diff --git a/gcc/testsuite/g++.dg/opt/pr94589-4.C b/gcc/testsuite/g++.dg/opt/pr94589-4.C
+new file mode 100644
+index 000000000..256a45580
+--- /dev/null
++++ b/gcc/testsuite/g++.dg/opt/pr94589-4.C
+@@ -0,0 +1,84 @@
++// { dg-do run { target c++20 } }
++// { dg-options "-O2 -g -ffast-math" }
++
++#include "pr94589-2.C"
++
++#define C(fn, i, j, r) if (fn (i, j) != r) __builtin_abort ()
++#define D(fn, i, r) if (fn (i) != r) __builtin_abort ()
++
++int
++main ()
++{
++ C (f1, 7.0, 8.0, false);
++ C (f1, 8.0, 8.0, true);
++ C (f1, 9.0, 8.0, false);
++ C (f2, 7.0, 8.0, true);
++ C (f2, 8.0, 8.0, false);
++ C (f2, 9.0, 8.0, true);
++ C (f3, 7.0, 8.0, false);
++ C (f3, 8.0, 8.0, false);
++ C (f3, 9.0, 8.0, true);
++ C (f4, 7.0, 8.0, true);
++ C (f4, 8.0, 8.0, false);
++ C (f4, 9.0, 8.0, false);
++ C (f5, 7.0, 8.0, false);
++ C (f5, 8.0, 8.0, true);
++ C (f5, 9.0, 8.0, true);
++ C (f6, 7.0, 8.0, true);
++ C (f6, 8.0, 8.0, true);
++ C (f6, 9.0, 8.0, false);
++ C (f7, 7.0, 8.0, true);
++ C (f7, 8.0, 8.0, false);
++ C (f7, 9.0, 8.0, false);
++ C (f8, 7.0, 8.0, false);
++ C (f8, 8.0, 8.0, true);
++ C (f8, 9.0, 8.0, true);
++ C (f9, 7.0, 8.0, false);
++ C (f9, 8.0, 8.0, true);
++ C (f9, 9.0, 8.0, false);
++ C (f10, 7.0, 8.0, true);
++ C (f10, 8.0, 8.0, false);
++ C (f10, 9.0, 8.0, true);
++ C (f11, 7.0, 8.0, false);
++ C (f11, 8.0, 8.0, false);
++ C (f11, 9.0, 8.0, true);
++ C (f12, 7.0, 8.0, true);
++ C (f12, 8.0, 8.0, true);
++ C (f12, 9.0, 8.0, false);
++ D (f13, 4.0, false);
++ D (f13, 5.0, true);
++ D (f13, 6.0, false);
++ D (f14, 4.0, true);
++ D (f14, 5.0, false);
++ D (f14, 6.0, true);
++ D (f15, 4.0, false);
++ D (f15, 5.0, false);
++ D (f15, 6.0, true);
++ D (f16, 4.0, true);
++ D (f16, 5.0, false);
++ D (f16, 6.0, false);
++ D (f17, 4.0, false);
++ D (f17, 5.0, true);
++ D (f17, 6.0, true);
++ D (f18, 4.0, true);
++ D (f18, 5.0, true);
++ D (f18, 6.0, false);
++ D (f19, 4.0, true);
++ D (f19, 5.0, false);
++ D (f19, 6.0, false);
++ D (f20, 4.0, false);
++ D (f20, 5.0, true);
++ D (f20, 6.0, true);
++ D (f21, 4.0, false);
++ D (f21, 5.0, true);
++ D (f21, 6.0, false);
++ D (f22, 4.0, true);
++ D (f22, 5.0, false);
++ D (f22, 6.0, true);
++ D (f23, 4.0, false);
++ D (f23, 5.0, false);
++ D (f23, 6.0, true);
++ D (f24, 4.0, true);
++ D (f24, 5.0, true);
++ D (f24, 6.0, false);
++}
+diff --git a/gcc/testsuite/gcc.dg/pr94589-1.c b/gcc/testsuite/gcc.dg/pr94589-1.c
+new file mode 100644
+index 000000000..de404ea82
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/pr94589-1.c
+@@ -0,0 +1,35 @@
++/* PR tree-optimization/94589 */
++/* { dg-do compile } */
++/* { dg-options "-O2 -g0 -fdump-tree-optimized" } */
++/* { dg-final { scan-tree-dump-times "\[ij]_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[ij]_\[0-9]+\\(D\\)" 14 "optimized" } } */
++/* { dg-final { scan-tree-dump-times "i_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[45]" 14 "optimized" } } */
++
++#define A __attribute__((noipa))
++A int f1 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c == 0; }
++A int f2 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c != 0; }
++A int f3 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c > 0; }
++A int f4 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c < 0; }
++A int f5 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c >= 0; }
++A int f6 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c <= 0; }
++A int f7 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c == -1; }
++A int f8 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c != -1; }
++A int f9 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c > -1; }
++A int f10 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c <= -1; }
++A int f11 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c == 1; }
++A int f12 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c != 1; }
++A int f13 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c < 1; }
++A int f14 (int i, int j) { int c = i == j ? 0 : i < j ? -1 : 1; return c >= 1; }
++A int f15 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c == 0; }
++A int f16 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c != 0; }
++A int f17 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c > 0; }
++A int f18 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c < 0; }
++A int f19 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c >= 0; }
++A int f20 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c <= 0; }
++A int f21 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c == -1; }
++A int f22 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c != -1; }
++A int f23 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c > -1; }
++A int f24 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c <= -1; }
++A int f25 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c == 1; }
++A int f26 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c != 1; }
++A int f27 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c < 1; }
++A int f28 (int i) { int c = i == 5 ? 0 : i < 5 ? -1 : 1; return c >= 1; }
+diff --git a/gcc/testsuite/gcc.dg/pr94589-2.c b/gcc/testsuite/gcc.dg/pr94589-2.c
+new file mode 100644
+index 000000000..9481b764d
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/pr94589-2.c
+@@ -0,0 +1,35 @@
++/* PR tree-optimization/94589 */
++/* { dg-do compile } */
++/* { dg-options "-O2 -g0 -ffast-math -fdump-tree-optimized" } */
++/* { dg-final { scan-tree-dump-times "\[ij]_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) \[ij]_\[0-9]+\\(D\\)" 14 "optimized" } } */
++/* { dg-final { scan-tree-dump-times "i_\[0-9]+\\(D\\) (?:<|<=|==|!=|>|>=) 5\\.0" 14 "optimized" } } */
++
++#define A __attribute__((noipa))
++A int f1 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c == 0; }
++A int f2 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c != 0; }
++A int f3 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c > 0; }
++A int f4 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c < 0; }
++A int f5 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c >= 0; }
++A int f6 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c <= 0; }
++A int f7 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c == -1; }
++A int f8 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c != -1; }
++A int f9 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c > -1; }
++A int f10 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c <= -1; }
++A int f11 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c == 1; }
++A int f12 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c != 1; }
++A int f13 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c < 1; }
++A int f14 (double i, double j) { int c; if (i == j) c = 0; else if (i < j) c = -1; else if (i > j) c = 1; else c = 2; return c >= 1; }
++A int f15 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c == 0; }
++A int f16 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c != 0; }
++A int f17 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c > 0; }
++A int f18 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c < 0; }
++A int f19 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c >= 0; }
++A int f20 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c <= 0; }
++A int f21 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c == -1; }
++A int f22 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c != -1; }
++A int f23 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c > -1; }
++A int f24 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c <= -1; }
++A int f25 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c == 1; }
++A int f26 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c != 1; }
++A int f27 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c < 1; }
++A int f28 (double i) { int c; if (i == 5.0) c = 0; else if (i < 5.0) c = -1; else if (i > 5.0) c = 1; else c = 2; return c >= 1; }
+diff --git a/gcc/testsuite/gcc.dg/pr94589-3.c b/gcc/testsuite/gcc.dg/pr94589-3.c
+new file mode 100644
+index 000000000..df82fab73
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/pr94589-3.c
+@@ -0,0 +1,97 @@
++/* { dg-do run } */
++/* { dg-options "-O2 -g" } */
++
++#include "pr94589-1.c"
++
++#define C(fn, i, j, r) if (fn (i, j) != r) __builtin_abort ()
++#define D(fn, i, r) if (fn (i) != r) __builtin_abort ()
++
++int
++main ()
++{
++ C (f1, 7, 8, 0);
++ C (f1, 8, 8, 1);
++ C (f1, 9, 8, 0);
++ C (f2, 7, 8, 1);
++ C (f2, 8, 8, 0);
++ C (f2, 9, 8, 1);
++ C (f3, 7, 8, 0);
++ C (f3, 8, 8, 0);
++ C (f3, 9, 8, 1);
++ C (f4, 7, 8, 1);
++ C (f4, 8, 8, 0);
++ C (f4, 9, 8, 0);
++ C (f5, 7, 8, 0);
++ C (f5, 8, 8, 1);
++ C (f5, 9, 8, 1);
++ C (f6, 7, 8, 1);
++ C (f6, 8, 8, 1);
++ C (f6, 9, 8, 0);
++ C (f7, 7, 8, 1);
++ C (f7, 8, 8, 0);
++ C (f7, 9, 8, 0);
++ C (f8, 7, 8, 0);
++ C (f8, 8, 8, 1);
++ C (f8, 9, 8, 1);
++ C (f9, 7, 8, 0);
++ C (f9, 8, 8, 1);
++ C (f9, 9, 8, 1);
++ C (f10, 7, 8, 1);
++ C (f10, 8, 8, 0);
++ C (f10, 9, 8, 0);
++ C (f11, 7, 8, 0);
++ C (f11, 8, 8, 0);
++ C (f11, 9, 8, 1);
++ C (f12, 7, 8, 1);
++ C (f12, 8, 8, 1);
++ C (f12, 9, 8, 0);
++ C (f13, 7, 8, 1);
++ C (f13, 8, 8, 1);
++ C (f13, 9, 8, 0);
++ C (f14, 7, 8, 0);
++ C (f14, 8, 8, 0);
++ C (f14, 9, 8, 1);
++ D (f15, 4, 0);
++ D (f15, 5, 1);
++ D (f15, 6, 0);
++ D (f16, 4, 1);
++ D (f16, 5, 0);
++ D (f16, 6, 1);
++ D (f17, 4, 0);
++ D (f17, 5, 0);
++ D (f17, 6, 1);
++ D (f18, 4, 1);
++ D (f18, 5, 0);
++ D (f18, 6, 0);
++ D (f19, 4, 0);
++ D (f19, 5, 1);
++ D (f19, 6, 1);
++ D (f20, 4, 1);
++ D (f20, 5, 1);
++ D (f20, 6, 0);
++ D (f21, 4, 1);
++ D (f21, 5, 0);
++ D (f21, 6, 0);
++ D (f22, 4, 0);
++ D (f22, 5, 1);
++ D (f22, 6, 1);
++ D (f23, 4, 0);
++ D (f23, 5, 1);
++ D (f23, 6, 1);
++ D (f24, 4, 1);
++ D (f24, 5, 0);
++ D (f24, 6, 0);
++ D (f25, 4, 0);
++ D (f25, 5, 0);
++ D (f25, 6, 1);
++ D (f26, 4, 1);
++ D (f26, 5, 1);
++ D (f26, 6, 0);
++ D (f27, 4, 1);
++ D (f27, 5, 1);
++ D (f27, 6, 0);
++ D (f28, 4, 0);
++ D (f28, 5, 0);
++ D (f28, 6, 1);
++ return 0;
++}
+diff --git a/gcc/testsuite/gcc.dg/pr94589-4.c b/gcc/testsuite/gcc.dg/pr94589-4.c
+new file mode 100644
+index 000000000..b2557fb07
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/pr94589-4.c
+@@ -0,0 +1,97 @@
++/* { dg-do run } */
++/* { dg-options "-O2 -g -ffast-math" } */
++
++#include "pr94589-2.c"
++
++#define C(fn, i, j, r) if (fn (i, j) != r) __builtin_abort ()
++#define D(fn, i, r) if (fn (i) != r) __builtin_abort ()
++
++int
++main ()
++{
++ C (f1, 7.0, 8.0, 0);
++ C (f1, 8.0, 8.0, 1);
++ C (f1, 9.0, 8.0, 0);
++ C (f2, 7.0, 8.0, 1);
++ C (f2, 8.0, 8.0, 0);
++ C (f2, 9.0, 8.0, 1);
++ C (f3, 7.0, 8.0, 0);
++ C (f3, 8.0, 8.0, 0);
++ C (f3, 9.0, 8.0, 1);
++ C (f4, 7.0, 8.0, 1);
++ C (f4, 8.0, 8.0, 0);
++ C (f4, 9.0, 8.0, 0);
++ C (f5, 7.0, 8.0, 0);
++ C (f5, 8.0, 8.0, 1);
++ C (f5, 9.0, 8.0, 1);
++ C (f6, 7.0, 8.0, 1);
++ C (f6, 8.0, 8.0, 1);
++ C (f6, 9.0, 8.0, 0);
++ C (f7, 7.0, 8.0, 1);
++ C (f7, 8.0, 8.0, 0);
++ C (f7, 9.0, 8.0, 0);
++ C (f8, 7.0, 8.0, 0);
++ C (f8, 8.0, 8.0, 1);
++ C (f8, 9.0, 8.0, 1);
++ C (f9, 7.0, 8.0, 0);
++ C (f9, 8.0, 8.0, 1);
++ C (f9, 9.0, 8.0, 1);
++ C (f10, 7.0, 8.0, 1);
++ C (f10, 8.0, 8.0, 0);
++ C (f10, 9.0, 8.0, 0);
++ C (f11, 7.0, 8.0, 0);
++ C (f11, 8.0, 8.0, 0);
++ C (f11, 9.0, 8.0, 1);
++ C (f12, 7.0, 8.0, 1);
++ C (f12, 8.0, 8.0, 1);
++ C (f12, 9.0, 8.0, 0);
++ C (f13, 7.0, 8.0, 1);
++ C (f13, 8.0, 8.0, 1);
++ C (f13, 9.0, 8.0, 0);
++ C (f14, 7.0, 8.0, 0);
++ C (f14, 8.0, 8.0, 0);
++ C (f14, 9.0, 8.0, 1);
++ D (f15, 4.0, 0);
++ D (f15, 5.0, 1);
++ D (f15, 6.0, 0);
++ D (f16, 4.0, 1);
++ D (f16, 5.0, 0);
++ D (f16, 6.0, 1);
++ D (f17, 4.0, 0);
++ D (f17, 5.0, 0);
++ D (f17, 6.0, 1);
++ D (f18, 4.0, 1);
++ D (f18, 5.0, 0);
++ D (f18, 6.0, 0);
++ D (f19, 4.0, 0);
++ D (f19, 5.0, 1);
++ D (f19, 6.0, 1);
++ D (f20, 4.0, 1);
++ D (f20, 5.0, 1);
++ D (f20, 6.0, 0);
++ D (f21, 4.0, 1);
++ D (f21, 5.0, 0);
++ D (f21, 6.0, 0);
++ D (f22, 4.0, 0);
++ D (f22, 5.0, 1);
++ D (f22, 6.0, 1);
++ D (f23, 4.0, 0);
++ D (f23, 5.0, 1);
++ D (f23, 6.0, 1);
++ D (f24, 4.0, 1);
++ D (f24, 5.0, 0);
++ D (f24, 6.0, 0);
++ D (f25, 4.0, 0);
++ D (f25, 5.0, 0);
++ D (f25, 6.0, 1);
++ D (f26, 4.0, 1);
++ D (f26, 5.0, 1);
++ D (f26, 6.0, 0);
++ D (f27, 4.0, 1);
++ D (f27, 5.0, 1);
++ D (f27, 6.0, 0);
++ D (f28, 4.0, 0);
++ D (f28, 5.0, 0);
++ D (f28, 6.0, 1);
++ return 0;
++}
+diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c
+index b9cd07a60..fca32222f 100644
+--- a/gcc/tree-ssa-phiopt.c
++++ b/gcc/tree-ssa-phiopt.c
+@@ -63,6 +63,8 @@ static bool abs_replacement (basic_block, basic_block,
+ edge, edge, gimple *, tree, tree);
+ static bool xor_replacement (basic_block, basic_block,
+ edge, edge, gimple *, tree, tree);
++static bool spaceship_replacement (basic_block, basic_block,
++ edge, edge, gphi *, tree, tree);
+ static bool cond_removal_in_popcount_clz_ctz_pattern (basic_block, basic_block,
+ edge, edge, gimple *,
+ tree, tree);
+@@ -361,6 +363,8 @@ tree_ssa_phiopt_worker (bool do_store_elim, bool do_hoist_loads, bool early_p)
+ cfgchanged = true;
+ else if (minmax_replacement (bb, bb1, e1, e2, phi, arg0, arg1))
+ cfgchanged = true;
++ else if (spaceship_replacement (bb, bb1, e1, e2, phi, arg0, arg1))
++ cfgchanged = true;
+ }
+ }
+
+@@ -1753,6 +1757,426 @@ minmax_replacement (basic_block cond_bb, basic_block middle_bb,
+ return true;
+ }
+
++/* Return true if the only executable statement in BB is a GIMPLE_COND. */
++
++static bool
++cond_only_block_p (basic_block bb)
++{
++ /* BB must have no executable statements. */
++ gimple_stmt_iterator gsi = gsi_after_labels (bb);
++ if (phi_nodes (bb))
++ return false;
++ while (!gsi_end_p (gsi))
++ {
++ gimple *stmt = gsi_stmt (gsi);
++ if (is_gimple_debug (stmt))
++ ;
++ else if (gimple_code (stmt) == GIMPLE_NOP
++ || gimple_code (stmt) == GIMPLE_PREDICT
++ || gimple_code (stmt) == GIMPLE_COND)
++ ;
++ else
++ return false;
++ gsi_next (&gsi);
++ }
++ return true;
++}
++
++/* Attempt to optimize (x <=> y) cmp 0 and similar comparisons.
++ For strong ordering <=> try to match something like:
++ <bb 2> : // cond3_bb (== cond2_bb)
++ if (x_4(D) != y_5(D))
++ goto <bb 3>; [INV]
++ else
++ goto <bb 6>; [INV]
++
++ <bb 3> : // cond_bb
++ if (x_4(D) < y_5(D))
++ goto <bb 6>; [INV]
++ else
++ goto <bb 4>; [INV]
++
++ <bb 4> : // middle_bb
++
++ <bb 6> : // phi_bb
++ # iftmp.0_2 = PHI <1(4), 0(2), -1(3)>
++ _1 = iftmp.0_2 == 0;
++
++ and for partial ordering <=> something like:
++
++ <bb 2> : // cond3_bb
++ if (a_3(D) == b_5(D))
++ goto <bb 6>; [50.00%]
++ else
++ goto <bb 3>; [50.00%]
++
++ <bb 3> [local count: 536870913]: // cond2_bb
++ if (a_3(D) < b_5(D))
++ goto <bb 6>; [50.00%]
++ else
++ goto <bb 4>; [50.00%]
++
++ <bb 4> [local count: 268435456]: // cond_bb
++ if (a_3(D) > b_5(D))
++ goto <bb 6>; [50.00%]
++ else
++ goto <bb 5>; [50.00%]
++
++ <bb 5> [local count: 134217728]: // middle_bb
++
++ <bb 6> [local count: 1073741824]: // phi_bb
++ # SR.27_4 = PHI <0(2), -1(3), 1(4), 2(5)>
++ _2 = SR.27_4 > 0; */
++
++static bool
++spaceship_replacement (basic_block cond_bb, basic_block middle_bb,
++ edge e0, edge e1, gphi *phi,
++ tree arg0, tree arg1)
++{
++ if (!INTEGRAL_TYPE_P (TREE_TYPE (PHI_RESULT (phi)))
++ || TYPE_UNSIGNED (TREE_TYPE (PHI_RESULT (phi)))
++ || !tree_fits_shwi_p (arg0)
++ || !tree_fits_shwi_p (arg1)
++ || !IN_RANGE (tree_to_shwi (arg0), -1, 2)
++ || !IN_RANGE (tree_to_shwi (arg1), -1, 2))
++ return false;
++
++ basic_block phi_bb = gimple_bb (phi);
++ gcc_assert (phi_bb == e0->dest && phi_bb == e1->dest);
++ if (!IN_RANGE (EDGE_COUNT (phi_bb->preds), 3, 4))
++ return false;
++
++ use_operand_p use_p;
++ gimple *use_stmt;
++ if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_RESULT (phi)))
++ return false;
++ if (!single_imm_use (PHI_RESULT (phi), &use_p, &use_stmt))
++ return false;
++ enum tree_code cmp;
++ tree lhs, rhs;
++ if (gimple_code (use_stmt) == GIMPLE_COND)
++ {
++ cmp = gimple_cond_code (use_stmt);
++ lhs = gimple_cond_lhs (use_stmt);
++ rhs = gimple_cond_rhs (use_stmt);
++ }
++ else if (is_gimple_assign (use_stmt))
++ {
++ if (gimple_assign_rhs_class (use_stmt) == GIMPLE_BINARY_RHS)
++ {
++ cmp = gimple_assign_rhs_code (use_stmt);
++ lhs = gimple_assign_rhs1 (use_stmt);
++ rhs = gimple_assign_rhs2 (use_stmt);
++ }
++ else if (gimple_assign_rhs_code (use_stmt) == COND_EXPR)
++ {
++ tree cond = gimple_assign_rhs1 (use_stmt);
++ if (!COMPARISON_CLASS_P (cond))
++ return false;
++ cmp = TREE_CODE (cond);
++ lhs = TREE_OPERAND (cond, 0);
++ rhs = TREE_OPERAND (cond, 1);
++ }
++ else
++ return false;
++ }
++ else
++ return false;
++ switch (cmp)
++ {
++ case EQ_EXPR:
++ case NE_EXPR:
++ case LT_EXPR:
++ case GT_EXPR:
++ case LE_EXPR:
++ case GE_EXPR:
++ break;
++ default:
++ return false;
++ }
++ if (lhs != PHI_RESULT (phi)
++ || !tree_fits_shwi_p (rhs)
++ || !IN_RANGE (tree_to_shwi (rhs), -1, 1))
++ return false;
++
++ if (!empty_block_p (middle_bb))
++ return false;
++
++ gcond *cond1 = as_a <gcond *> (last_stmt (cond_bb));
++ enum tree_code cmp1 = gimple_cond_code (cond1);
++ if (cmp1 != LT_EXPR && cmp1 != GT_EXPR)
++ return false;
++ tree lhs1 = gimple_cond_lhs (cond1);
++ tree rhs1 = gimple_cond_rhs (cond1);
++ /* The optimization may be unsafe due to NaNs. */
++ if (HONOR_NANS (TREE_TYPE (lhs1)))
++ return false;
++ if (TREE_CODE (lhs1) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs1))
++ return false;
++ if (TREE_CODE (rhs1) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs1))
++ return false;
++
++ if (!single_pred_p (cond_bb) || !cond_only_block_p (cond_bb))
++ return false;
++
++ basic_block cond2_bb = single_pred (cond_bb);
++ if (EDGE_COUNT (cond2_bb->succs) != 2)
++ return false;
++ edge cond2_phi_edge;
++ if (EDGE_SUCC (cond2_bb, 0)->dest == cond_bb)
++ {
++ if (EDGE_SUCC (cond2_bb, 1)->dest != phi_bb)
++ return false;
++ cond2_phi_edge = EDGE_SUCC (cond2_bb, 1);
++ }
++ else if (EDGE_SUCC (cond2_bb, 0)->dest != phi_bb)
++ return false;
++ else
++ cond2_phi_edge = EDGE_SUCC (cond2_bb, 0);
++ tree arg2 = gimple_phi_arg_def (phi, cond2_phi_edge->dest_idx);
++ if (!tree_fits_shwi_p (arg2))
++ return false;
++ gimple *cond2 = last_stmt (cond2_bb);
++ if (cond2 == NULL || gimple_code (cond2) != GIMPLE_COND)
++ return false;
++ enum tree_code cmp2 = gimple_cond_code (cond2);
++ tree lhs2 = gimple_cond_lhs (cond2);
++ tree rhs2 = gimple_cond_rhs (cond2);
++ if (lhs2 == lhs1)
++ {
++ if (!operand_equal_p (rhs2, rhs1, 0))
++ return false;
++ }
++ else if (lhs2 == rhs1)
++ {
++ if (rhs2 != lhs1)
++ return false;
++ }
++ else
++ return false;
++
++ tree arg3 = arg2;
++ basic_block cond3_bb = cond2_bb;
++ edge cond3_phi_edge = cond2_phi_edge;
++ gimple *cond3 = cond2;
++ enum tree_code cmp3 = cmp2;
++ tree lhs3 = lhs2;
++ tree rhs3 = rhs2;
++ if (EDGE_COUNT (phi_bb->preds) == 4)
++ {
++ if (absu_hwi (tree_to_shwi (arg2)) != 1)
++ return false;
++ if (e1->flags & EDGE_TRUE_VALUE)
++ {
++ if (tree_to_shwi (arg0) != 2
++ || absu_hwi (tree_to_shwi (arg1)) != 1
++ || wi::to_widest (arg1) == wi::to_widest (arg2))
++ return false;
++ }
++ else if (tree_to_shwi (arg1) != 2
++ || absu_hwi (tree_to_shwi (arg0)) != 1
++ || wi::to_widest (arg0) == wi::to_widest (arg1))
++ return false;
++ if (cmp2 != LT_EXPR && cmp2 != GT_EXPR)
++ return false;
++ /* if (x < y) goto phi_bb; else fallthru;
++ if (x > y) goto phi_bb; else fallthru;
++ bbx:;
++ phi_bb:;
++ is ok, but if x and y are swapped in one of the comparisons,
++ or the comparisons are the same and operands not swapped,
++ or second goto phi_bb is not the true edge, it is not. */
++ if ((lhs2 == lhs1)
++ ^ (cmp2 == cmp1)
++ ^ ((e1->flags & EDGE_TRUE_VALUE) != 0))
++ return false;
++ if ((cond2_phi_edge->flags & EDGE_TRUE_VALUE) == 0)
++ return false;
++ if (!single_pred_p (cond2_bb) || !cond_only_block_p (cond2_bb))
++ return false;
++ cond3_bb = single_pred (cond2_bb);
++ if (EDGE_COUNT (cond2_bb->succs) != 2)
++ return false;
++ if (EDGE_SUCC (cond3_bb, 0)->dest == cond2_bb)
++ {
++ if (EDGE_SUCC (cond3_bb, 1)->dest != phi_bb)
++ return false;
++ cond3_phi_edge = EDGE_SUCC (cond3_bb, 1);
++ }
++ else if (EDGE_SUCC (cond3_bb, 0)->dest != phi_bb)
++ return false;
++ else
++ cond3_phi_edge = EDGE_SUCC (cond3_bb, 0);
++ arg3 = gimple_phi_arg_def (phi, cond3_phi_edge->dest_idx);
++ cond3 = last_stmt (cond3_bb);
++ if (cond3 == NULL || gimple_code (cond3) != GIMPLE_COND)
++ return false;
++ cmp3 = gimple_cond_code (cond3);
++ lhs3 = gimple_cond_lhs (cond3);
++ rhs3 = gimple_cond_rhs (cond3);
++ if (lhs3 == lhs1)
++ {
++ if (!operand_equal_p (rhs3, rhs1, 0))
++ return false;
++ }
++ else if (lhs3 == rhs1)
++ {
++ if (rhs3 != lhs1)
++ return false;
++ }
++ else
++ return false;
++ }
++ else if (absu_hwi (tree_to_shwi (arg0)) != 1
++ || absu_hwi (tree_to_shwi (arg1)) != 1
++ || wi::to_widest (arg0) == wi::to_widest (arg1))
++ return false;
++
++ if (!integer_zerop (arg3) || (cmp3 != EQ_EXPR && cmp3 != NE_EXPR))
++ return false;
++ if ((cond3_phi_edge->flags & (cmp3 == EQ_EXPR
++ ? EDGE_TRUE_VALUE : EDGE_FALSE_VALUE)) == 0)
++ return false;
++
++ /* lhs1 one_cmp rhs1 results in PHI_RESULT (phi) of 1. */
++ enum tree_code one_cmp;
++ if ((cmp1 == LT_EXPR)
++ ^ (!integer_onep ((e1->flags & EDGE_TRUE_VALUE) ? arg1 : arg0)))
++ one_cmp = LT_EXPR;
++ else
++ one_cmp = GT_EXPR;
++
++ enum tree_code res_cmp;
++ switch (cmp)
++ {
++ case EQ_EXPR:
++ if (integer_zerop (rhs))
++ res_cmp = EQ_EXPR;
++ else if (integer_minus_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GT_EXPR : LT_EXPR;
++ else if (integer_onep (rhs))
++ res_cmp = one_cmp;
++ else
++ return false;
++ break;
++ case NE_EXPR:
++ if (integer_zerop (rhs))
++ res_cmp = NE_EXPR;
++ else if (integer_minus_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? LE_EXPR : GE_EXPR;
++ else if (integer_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GE_EXPR : LE_EXPR;
++ else
++ return false;
++ break;
++ case LT_EXPR:
++ if (integer_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GE_EXPR : LE_EXPR;
++ else if (integer_zerop (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GT_EXPR : LT_EXPR;
++ else
++ return false;
++ break;
++ case LE_EXPR:
++ if (integer_zerop (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GE_EXPR : LE_EXPR;
++ else if (integer_minus_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? GT_EXPR : LT_EXPR;
++ else
++ return false;
++ break;
++ case GT_EXPR:
++ if (integer_minus_onep (rhs))
++ res_cmp = one_cmp == LT_EXPR ? LE_EXPR : GE_EXPR;
++ else if (integer_zerop (rhs))
++ res_cmp = one_cmp;
++ else
++ return false;
++ break;
++ case GE_EXPR:
++ if (integer_zerop (rhs))
++ res_cmp = one_cmp == LT_EXPR ? LE_EXPR : GE_EXPR;
++ else if (integer_onep (rhs))
++ res_cmp = one_cmp;
++ else
++ return false;
++ break;
++ default:
++ gcc_unreachable ();
++ }
++
++ if (gimple_code (use_stmt) == GIMPLE_COND)
++ {
++ gcond *use_cond = as_a <gcond *> (use_stmt);
++ gimple_cond_set_code (use_cond, res_cmp);
++ gimple_cond_set_lhs (use_cond, lhs1);
++ gimple_cond_set_rhs (use_cond, rhs1);
++ }
++ else if (gimple_assign_rhs_class (use_stmt) == GIMPLE_BINARY_RHS)
++ {
++ gimple_assign_set_rhs_code (use_stmt, res_cmp);
++ gimple_assign_set_rhs1 (use_stmt, lhs1);
++ gimple_assign_set_rhs2 (use_stmt, rhs1);
++ }
++ else
++ {
++ tree cond = build2 (res_cmp, TREE_TYPE (gimple_assign_rhs1 (use_stmt)),
++ lhs1, rhs1);
++ gimple_assign_set_rhs1 (use_stmt, cond);
++ }
++ update_stmt (use_stmt);
++
++ if (MAY_HAVE_DEBUG_BIND_STMTS)
++ {
++ use_operand_p use_p;
++ imm_use_iterator iter;
++ bool has_debug_uses = false;
++ FOR_EACH_IMM_USE_FAST (use_p, iter, PHI_RESULT (phi))
++ {
++ gimple *use_stmt = USE_STMT (use_p);
++ gcc_assert (is_gimple_debug (use_stmt));
++ has_debug_uses = true;
++ break;
++ }
++
++ if (has_debug_uses)
++ {
++ /* If there are debug uses, emit something like:
++ # DEBUG D#1 => i_2(D) > j_3(D) ? 1 : -1
++ # DEBUG D#2 => i_2(D) == j_3(D) ? 0 : D#1
++ where > stands for the comparison that yielded 1
++ and replace debug uses of phi result with that D#2.
++ Ignore the value of 2, because if NaNs aren't expected,
++ all floating point numbers should be comparable. */
++ gimple_stmt_iterator gsi = gsi_after_labels (gimple_bb (phi));
++ tree type = TREE_TYPE (PHI_RESULT (phi));
++ tree temp1 = make_node (DEBUG_EXPR_DECL);
++ DECL_ARTIFICIAL (temp1) = 1;
++ TREE_TYPE (temp1) = type;
++ SET_DECL_MODE (temp1, TYPE_MODE (type));
++ tree t = build2 (one_cmp, boolean_type_node, lhs1, rhs2);
++ t = build3 (COND_EXPR, type, t, build_one_cst (type),
++ build_int_cst (type, -1));
++ gimple *g = gimple_build_debug_bind (temp1, t, phi);
++ gsi_insert_before (&gsi, g, GSI_SAME_STMT);
++ tree temp2 = make_node (DEBUG_EXPR_DECL);
++ DECL_ARTIFICIAL (temp2) = 1;
++ TREE_TYPE (temp2) = type;
++ SET_DECL_MODE (temp2, TYPE_MODE (type));
++ t = build2 (EQ_EXPR, boolean_type_node, lhs1, rhs2);
++ t = build3 (COND_EXPR, type, t, build_zero_cst (type), temp1);
++ g = gimple_build_debug_bind (temp2, t, phi);
++ gsi_insert_before (&gsi, g, GSI_SAME_STMT);
++ replace_uses_by (PHI_RESULT (phi), temp2);
++ }
++ }
++
++ gimple_stmt_iterator psi = gsi_for_stmt (phi);
++ remove_phi_node (&psi, true);
++
++ return true;
++}
++
+ /* Convert
+
+ <bb 2>
+--
+2.27.0.windows.1
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 04:08:34 +0000