[PATCH v7, rs6000] Implemented f[min/max]_optab by xs[min/max]dp [PR103605]

[HAO CHEN GUI <guihaoc@linux.ibm.com>]

Hi,
  This patch implements optab f[min/max]_optab by xs[min/max]dp on rs6000.
Tests show that outputs of xs[min/max]dp are consistent with the standard
of C99 fmin/max.

  This patch also binds __builtin_vsx_xs[min/max]dp to fmin/max instead
of smin/max when fast-math is not set. While fast-math is set, xs[min/max]dp
are folded to MIN/MAX_EXPR in gimple, and finally expanded to smin/max.

  Bootstrapped and tested on ppc64 Linux BE and LE with no regressions.
Is this okay for trunk? Any recommendations? Thanks a lot.

ChangeLog
2022-09-26 Haochen Gui <guihaoc@linux.ibm.com>

gcc/
	PR target/103605
	* config/rs6000/rs6000-builtin.cc (rs6000_gimple_fold_builtin): Gimple
	fold RS6000_BIF_XSMINDP and RS6000_BIF_XSMAXDP when fast-math is set.
	* config/rs6000/rs6000.md (FMINMAX): New int iterator.
	(minmax_op): New int attribute.
	(UNSPEC_FMAX, UNSPEC_FMIN): New unspecs.
	(f<minmax_op><mode>3): New pattern by UNSPEC_FMAX and UNSPEC_FMIN.
	* config/rs6000/rs6000-builtins.def (__builtin_vsx_xsmaxdp): Set
	pattern to fmaxdf3.
	(__builtin_vsx_xsmindp): Set pattern to fmindf3.

gcc/testsuite/
	PR target/103605
	* gcc.dg/powerpc/pr103605.h: New.
	* gcc.dg/powerpc/pr103605-1.c: New.
	* gcc.dg/powerpc/pr103605-2.c: New.

patch.diff
diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index e925ba9fad9..944ae9fe55c 100644
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -1588,6 +1588,8 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator *gsi)
       gimple_set_location (g, gimple_location (stmt));
       gsi_replace (gsi, g, true);
       return true;
+    /* fold into MIN_EXPR when fast-math is set.  */
+    case RS6000_BIF_XSMINDP:
     /* flavors of vec_min.  */
     case RS6000_BIF_XVMINDP:
     case RS6000_BIF_XVMINSP:
@@ -1614,6 +1616,8 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator *gsi)
       gimple_set_location (g, gimple_location (stmt));
       gsi_replace (gsi, g, true);
       return true;
+    /* fold into MAX_EXPR when fast-math is set.  */
+    case RS6000_BIF_XSMAXDP:
     /* flavors of vec_max.  */
     case RS6000_BIF_XVMAXDP:
     case RS6000_BIF_XVMAXSP:
diff --git a/gcc/config/rs6000/rs6000-builtins.def b/gcc/config/rs6000/rs6000-builtins.def
index f4a9f24bcc5..8b735493b40 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -1613,10 +1613,10 @@
     XSCVSPDP vsx_xscvspdp {}

   const double __builtin_vsx_xsmaxdp (double, double);
-    XSMAXDP smaxdf3 {}
+    XSMAXDP fmaxdf3 {}

   const double __builtin_vsx_xsmindp (double, double);
-    XSMINDP smindf3 {}
+    XSMINDP fmindf3 {}

   const double __builtin_vsx_xsrdpi (double);
     XSRDPI vsx_xsrdpi {}
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index bf85baa5370..ae0dd98f0f9 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -158,6 +158,8 @@ (define_c_enum "unspec"
    UNSPEC_HASHCHK
    UNSPEC_XXSPLTIDP_CONST
    UNSPEC_XXSPLTIW_CONST
+   UNSPEC_FMAX
+   UNSPEC_FMIN
   ])

 ;;
@@ -5341,6 +5343,22 @@ (define_insn_and_split "*s<minmax><mode>3_fpr"
   DONE;
 })

+
+(define_int_iterator FMINMAX [UNSPEC_FMAX UNSPEC_FMIN])
+
+(define_int_attr  minmax_op [(UNSPEC_FMAX "max")
+			     (UNSPEC_FMIN "min")])
+
+(define_insn "f<minmax_op><mode>3"
+  [(set (match_operand:SFDF 0 "vsx_register_operand" "=wa")
+	(unspec:SFDF [(match_operand:SFDF 1 "vsx_register_operand" "wa")
+		      (match_operand:SFDF 2 "vsx_register_operand" "wa")]
+		     FMINMAX))]
+  "TARGET_VSX && !flag_finite_math_only"
+  "xs<minmax_op>dp %x0,%x1,%x2"
+  [(set_attr "type" "fp")]
+)
+
 (define_expand "mov<mode>cc"
    [(set (match_operand:GPR 0 "gpc_reg_operand")
 	 (if_then_else:GPR (match_operand 1 "comparison_operator")
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103605-1.c b/gcc/testsuite/gcc.target/powerpc/pr103605-1.c
new file mode 100644
index 00000000000..923deec6a1e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103605-1.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-options "-O2 -mvsx" } */
+/* { dg-final { scan-assembler-times {\mxsmaxdp\M} 3 } } */
+/* { dg-final { scan-assembler-times {\mxsmindp\M} 3 } } */
+
+#include "pr103605.h"
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103605-2.c b/gcc/testsuite/gcc.target/powerpc/pr103605-2.c
new file mode 100644
index 00000000000..f50fe9468f5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103605-2.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-options "-O2 -mvsx -ffast-math" } */
+/* { dg-final { scan-assembler-times {\mxsmaxcdp\M} 3 { target has_arch_pwr9 } } } */
+/* { dg-final { scan-assembler-times {\mxsmincdp\M} 3 { target has_arch_pwr9 } } } */
+/* { dg-final { scan-assembler-times {\mxsmaxdp\M} 3 { target { ! has_arch_pwr9 } } } } */
+/* { dg-final { scan-assembler-times {\mxsmindp\M} 3 { target { ! has_arch_pwr9 } } } } */
+
+#include "pr103605.h"
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103605.h b/gcc/testsuite/gcc.target/powerpc/pr103605.h
new file mode 100644
index 00000000000..c99dfe6d7eb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103605.h
@@ -0,0 +1,31 @@
+#include <math.h>
+
+double test1 (double d0, double d1)
+{
+  return fmin (d0, d1);
+}
+
+float test2 (float d0, float d1)
+{
+  return fmin (d0, d1);
+}
+
+double test3 (double d0, double d1)
+{
+  return fmax (d0, d1);
+}
+
+float test4 (float d0, float d1)
+{
+  return fmax (d0, d1);
+}
+
+double test5 (double d0, double d1)
+{
+  return __builtin_vsx_xsmindp (d0, d1);
+}
+
+double test6 (double d0, double d1)
+{
+  return __builtin_vsx_xsmaxdp (d0, d1);
+}