[gcc r12-4881] Simplify (trunc)copysign((extend)a, (extend)b) to .COPYSIGN (a, b).

[gcc r12-4881] Simplify (trunc)copysign((extend)a, (extend)b) to .COPYSIGN (a, b).

[hongtao Liu]

https://gcc.gnu.org/g:22ce7382fccc15ce2355306b3f5be7afc00f81f4

commit r12-4881-g22ce7382fccc15ce2355306b3f5be7afc00f81f4
Author: liuhongt <hongtao.liu@intel.com>
Date:   Wed Nov 3 16:07:34 2021 +0800

    Simplify (trunc)copysign((extend)a, (extend)b) to .COPYSIGN (a,b).
    
    a and b are same type as the truncation type and has less precision
    than extend type.
    
    gcc/ChangeLog:
    
            PR target/102464
            * match.pd: simplify (trunc)copysign((extend)a, (extend)b) to
            .COPYSIGN (a,b) when a and b are same type as the truncation
            type and has less precision than extend type.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/i386/pr102464-copysign-1.c: New test.

Diff:
---
 gcc/match.pd                                       | 14 ++++
 .../gcc.target/i386/pr102464-copysign-1.c          | 80 ++++++++++++++++++++++
 2 files changed, 94 insertions(+)

diff --git a/gcc/match.pd b/gcc/match.pd
index 0734c45700c..651982c28fe 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -6169,6 +6169,20 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 	  && direct_internal_fn_supported_p (as_internal_fn (tos),
 					     type, OPTIMIZE_FOR_BOTH))
        (tos @0))))
+
+/* Simplify (trunc)copysign ((extend)x, (extend)y) to copysignf (x, y),
+   x,y is float value, similar for _Float16/double.  */
+(for copysigns (COPYSIGN_ALL)
+ (simplify
+  (convert (copysigns (convert@2 @0) (convert @1)))
+   (if (optimize
+       && types_match (type, TREE_TYPE (@0))
+       && types_match (type, TREE_TYPE (@1))
+       && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (@2))
+       && direct_internal_fn_supported_p (IFN_COPYSIGN,
+					  type, OPTIMIZE_FOR_BOTH))
+    (IFN_COPYSIGN @0 @1))))
+
 #endif
 
 (for froms (XFLOORL XCEILL XROUNDL XRINTL)
diff --git a/gcc/testsuite/gcc.target/i386/pr102464-copysign-1.c b/gcc/testsuite/gcc.target/i386/pr102464-copysign-1.c
new file mode 100644
index 00000000000..95a39509738
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr102464-copysign-1.c
@@ -0,0 +1,80 @@
+/* PR target/102464.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512fp16 -mavx512vl -ftree-vectorize -mfpmath=sse -fdump-tree-optimized" } */
+
+#include<math.h>
+void foo1 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  for (int i = 0; i != 8; i++)
+    a[i] = copysignf (b[i], c[i]);
+}
+
+void foo2 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  for (int i = 0; i != 8; i++)
+    a[i] = copysign (b[i], c[i]);
+}
+
+void foo3 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  for (int i = 0; i != 8; i++)
+    a[i] = copysignl (b[i], c[i]);
+}
+
+void foo4 (float* __restrict a, float* b, float* c)
+{
+  for (int i = 0; i != 4; i++)
+    a[i] = copysign (b[i], c[i]);
+}
+
+void foo5 (float* __restrict a, float* b, float* c)
+{
+  for (int i = 0; i != 4; i++)
+    a[i] = copysignl (b[i], c[i]);
+}
+
+void foo6 (double* __restrict a, double* b, double* c)
+{
+  for (int i = 0; i != 4; i++)
+    a[i] = copysignl (b[i], c[i]);
+}
+
+void foo7 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  a[0] = copysignf (b[0], c[0]);
+}
+
+void foo8 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  a[0] = copysign (b[0], c[0]);
+}
+
+void foo9 (_Float16* __restrict a, _Float16* b, _Float16* c)
+{
+  a[0] = copysignl (b[0], c[0]);
+}
+
+void foo10 (float* __restrict a, float* b, float* c)
+{
+  a[0] = copysign (b[0], c[0]);
+}
+
+void foo11 (float* __restrict a, float* b, float* c)
+{
+  a[0] = copysignl (b[0], c[0]);
+}
+
+void foo12 (double* __restrict a, double* b, double* c)
+{
+  a[0] = copysignl (b[0], c[0]);
+}
+
+/* { dg-final { scan-assembler-not "vcvtsh2s\[sd\]" } } */
+/* { dg-final { scan-assembler-not "vcvtss2sd" } } */
+/* { dg-final { scan-assembler-not "fld" } } */
+/* { dg-final { scan-assembler-not "vcvtph2p\[sd\]" } } */
+/* { dg-final { scan-assembler-not "vcvtps2pd" } } */
+/* { dg-final { scan-assembler-not "extendhfxf" } } */
+/* { dg-final { scan-assembler-not "\\\{1to8\\\}" } } */
+/* { dg-final { scan-tree-dump-times "\.COPYSIGN" 12 "optimized" } } */
+/* { dg-final { scan-assembler-times "vpternlog" 12 } } */