[PATCH 2/3 V2] Fix IEEE 128-bit min/max test.

[Michael Meissner <meissner@linux.ibm.com>]

Here is a replacement patch.  Can I check this into the master branch, and
eventually backport it to GCC 11?

[PATCH] 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
was needed because big endian 32-bit code cannot enable the IEEE 128-bit
floating point instructions.

gcc/testsuite/
2021-06-17  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 target support.
---
 gcc/testsuite/gcc.target/powerpc/float128-minmax.c | 10 ++++++----
 gcc/testsuite/lib/target-supports.exp              | 10 ++++++++++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/gcc/testsuite/gcc.target/powerpc/float128-minmax.c b/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
index fe397518f2f..b0e6bd39873 100644
--- a/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
+++ b/gcc/testsuite/gcc.target/powerpc/float128-minmax.c
@@ -1,6 +1,5 @@
-/* { 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 +11,8 @@
 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.
-- 
2.31.1


-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.ibm.com, phone: +1 (978) 899-4797