[gcc r12-1938] Fix IEEE 128-bit min/max test.

[gcc r12-1938] Fix IEEE 128-bit min/max test.

[Michael Meissner]

https://gcc.gnu.org/g:730d021e3e4acc7c0031113ec720c82e31d405e5

commit r12-1938-g730d021e3e4acc7c0031113ec720c82e31d405e5
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Jun 30 14:54:48 2021 -0400

    Fix IEEE 128-bit min/max test.
    
    This patch fixes the float128-minmax.c test so that it can accommodate the
    generation of xsmincqp and xsmaxcqp instructions on power10.  I changed the
    effective target from 'float128' to 'ppc_float128_hw', since this needs the
    IEEE 128-bit float hardware support.  Changing to use 'ppc_float128_hw' allows
    the 'lp64' test to be dropped.  The 'lp64' test originally was needed because
    big endian 32-bit code cannot enable the IEEE 128-bit floating point
    instructions.
    
    gcc/testsuite/
    2021-06-30  Michael Meissner  <meissner@linux.ibm.com>
    
            * gcc.target/powerpc/float128-minmax.c: Adjust expected code for
            power10.
            * lib/target-supports.exp (check_effective_target_has_arch_pwr10):
            New.

Diff:
---
 gcc/testsuite/gcc.target/powerpc/float128-minmax.c | 11 ++++++-----
 gcc/testsuite/lib/target-supports.exp              | 10 ++++++++++
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/gcc/testsuite/gcc.target/powerpc/float128-minmax.c b/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
index fe397518f2f..ef8f729d9c2 100644
--- a/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
+++ b/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
@@ -1,6 +1,4 @@
-/* { dg-do compile { target lp64 } } */
-/* { dg-require-effective-target powerpc_p9vector_ok } */
-/* { dg-require-effective-target float128 } */
+/* { dg-require-effective-target ppc_float128_hw } */
 /* { dg-options "-mpower9-vector -O2 -ffast-math" } */
 
 #ifndef TYPE
@@ -12,5 +10,8 @@
 TYPE f128_min (TYPE a, TYPE b) { return __builtin_fminf128 (a, b); }
 TYPE f128_max (TYPE a, TYPE b) { return __builtin_fmaxf128 (a, b); }
 
-/* { dg-final { scan-assembler     {\mxscmpuqp\M} } } */
-/* { dg-final { scan-assembler-not {\mbl\M}       } } */
+/* Adjust code power10 which has native min/max instructions.  */
+/* { dg-final { scan-assembler-times {\mxscmpuqp\M} 2 { target { ! has_arch_pwr10 } } } } */
+/* { dg-final { scan-assembler-times {\mxsmincqp\M} 1 { target has_arch_pwr10 } } } */
+/* { dg-final { scan-assembler-times {\mxsmaxcqp\M} 1 { target has_arch_pwr10 } } } */
+/* { dg-final { scan-assembler-not {\mbl\M} } } */
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 7f78c5593ac..789723fb287 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -6127,6 +6127,16 @@ proc check_effective_target_has_arch_pwr9 { } {
 	}]
 }
 
+proc check_effective_target_has_arch_pwr10 { } {
+	return [check_no_compiler_messages arch_pwr10 assembly {
+		#ifndef _ARCH_PWR10
+		#error does not have power10 support.
+		#else
+		/* "has power10 support" */
+		#endif
+	}]
+}
+
 # Return 1 if this is a PowerPC target supporting -mcpu=power10.
 # Limit this to 64-bit linux systems for now until other targets support
 # power10.