[gcc r12-4242] Simplify (_Float16) ceil ((double) x) to .CEIL (x) when available.

[hongtao Liu <liuhongt@gcc.gnu.org>]

https://gcc.gnu.org/g:613196462a62a28de8414b9023ec2be9a29ac3dc

commit r12-4242-g613196462a62a28de8414b9023ec2be9a29ac3dc
Author: liuhongt <hongtao.liu@intel.com>
Date:   Fri Sep 24 19:17:42 2021 +0800

    Simplify (_Float16) ceil ((double) x) to .CEIL (x) when available.
    
    gcc/ChangeLog:
    
            PR target/102464
            * config/i386/i386.c (ix86_optab_supported_p):
            Return true for HFmode.
            * match.pd: Simplify (_Float16) ceil ((double) x) to
            __builtin_ceilf16 (a) when a is _Float16 type and
            direct_internal_fn_supported_p.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/i386/pr102464.c: New test.

Diff:
---
 gcc/config/i386/i386.c                   | 20 +++++++++-------
 gcc/match.pd                             | 29 ++++++++++++++++++++++++
 gcc/testsuite/gcc.target/i386/pr102464.c | 39 ++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+), 8 deletions(-)

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index a566d84a61e..7bc1b050756 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -23582,20 +23582,24 @@ ix86_optab_supported_p (int op, machine_mode mode1, machine_mode,
       return opt_type == OPTIMIZE_FOR_SPEED;
 
     case rint_optab:
-      if (SSE_FLOAT_MODE_P (mode1)
-	  && TARGET_SSE_MATH
-	  && !flag_trapping_math
-	  && !TARGET_SSE4_1)
+      if (mode1 == HFmode)
+	return true;
+      else if (SSE_FLOAT_MODE_P (mode1)
+	       && TARGET_SSE_MATH
+	       && !flag_trapping_math
+	       && !TARGET_SSE4_1)
 	return opt_type == OPTIMIZE_FOR_SPEED;
       return true;
 
     case floor_optab:
     case ceil_optab:
     case btrunc_optab:
-      if (SSE_FLOAT_MODE_P (mode1)
-	  && TARGET_SSE_MATH
-	  && !flag_trapping_math
-	  && TARGET_SSE4_1)
+      if (mode1 == HFmode)
+	return true;
+      else if (SSE_FLOAT_MODE_P (mode1)
+	       && TARGET_SSE_MATH
+	       && !flag_trapping_math
+	       && TARGET_SSE4_1)
 	return true;
       return opt_type == OPTIMIZE_FOR_SPEED;
 
diff --git a/gcc/match.pd b/gcc/match.pd
index a9791ceb74a..9d7c1ac637f 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -6191,6 +6191,35 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
    (froms (convert float_value_p@0))
    (convert (tos @0)))))
 
+#if GIMPLE
+(match float16_value_p
+ @0
+ (if (TYPE_MAIN_VARIANT (TREE_TYPE (@0)) == float16_type_node)))
+(for froms (BUILT_IN_TRUNCL BUILT_IN_TRUNC BUILT_IN_TRUNCF
+	    BUILT_IN_FLOORL BUILT_IN_FLOOR BUILT_IN_FLOORF
+	    BUILT_IN_CEILL BUILT_IN_CEIL BUILT_IN_CEILF
+	    BUILT_IN_ROUNDEVENL BUILT_IN_ROUNDEVEN BUILT_IN_ROUNDEVENF
+	    BUILT_IN_ROUNDL BUILT_IN_ROUND BUILT_IN_ROUNDF
+	    BUILT_IN_NEARBYINTL BUILT_IN_NEARBYINT BUILT_IN_NEARBYINTF
+	    BUILT_IN_RINTL BUILT_IN_RINT BUILT_IN_RINTF)
+     tos (IFN_TRUNC IFN_TRUNC IFN_TRUNC
+	  IFN_FLOOR IFN_FLOOR IFN_FLOOR
+	  IFN_CEIL IFN_CEIL IFN_CEIL
+	  IFN_ROUNDEVEN IFN_ROUNDEVEN IFN_ROUNDEVEN
+	  IFN_ROUND IFN_ROUND IFN_ROUND
+	  IFN_NEARBYINT IFN_NEARBYINT IFN_NEARBYINT
+	  IFN_RINT IFN_RINT IFN_RINT)
+ /* (_Float16) round ((doube) x) -> __built_in_roundf16 (x), etc.,
+    if x is a _Float16.  */
+ (simplify
+   (convert (froms (convert float16_value_p@0)))
+     (if (optimize
+	  && types_match (type, TREE_TYPE (@0))
+	  && direct_internal_fn_supported_p (as_internal_fn (tos),
+					     type, OPTIMIZE_FOR_BOTH))
+       (tos @0))))
+#endif
+
 (for froms (XFLOORL XCEILL XROUNDL XRINTL)
      tos (XFLOOR XCEIL XROUND XRINT)
  /* llfloorl(extend(x)) -> llfloor(x), etc., if x is a double.  */
diff --git a/gcc/testsuite/gcc.target/i386/pr102464.c b/gcc/testsuite/gcc.target/i386/pr102464.c
new file mode 100644
index 00000000000..e3e060ee80b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr102464.c
@@ -0,0 +1,39 @@
+/* PR target/102464.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512fp16" } */
+
+#define FOO(FUNC,SUFFIX)                       \
+  _Float16                                     \
+  foo_##FUNC##_##SUFFIX (_Float16 a)           \
+  {                                            \
+    return __builtin_##FUNC##SUFFIX (a);       \
+  }
+
+FOO (roundeven, f16);
+FOO (roundeven, f);
+FOO (roundeven, );
+FOO (roundeven, l);
+FOO (trunc, f16);
+FOO (trunc, f);
+FOO (trunc, );
+FOO (trunc, l);
+FOO (ceil, f16);
+FOO (ceil, f);
+FOO (ceil, );
+FOO (ceil, l);
+FOO (floor, f16);
+FOO (floor, f);
+FOO (floor, );
+FOO (floor, l);
+FOO (nearbyint, f16);
+FOO (nearbyint, f);
+FOO (nearbyint, );
+FOO (nearbyint, l);
+FOO (rint, f16);
+FOO (rint, f);
+FOO (rint, );
+FOO (rint, l);
+
+/* { dg-final { scan-assembler-not "vcvtsh2s\[sd\]" } } */
+/* { dg-final { scan-assembler-not "extendhfxf" } } */
+/* { dg-final { scan-assembler-times "vrndscalesh\[^\n\r\]*xmm\[0-9\]" 24 } } */