>From 327273dfeec5c000f3c33ca7b88ee0097fd33586 Mon Sep 17 00:00:00 2001
From: Michael Meissner <meiss...@linux.ibm.com>
Date: Wed, 25 Aug 2021 00:31:35 -0400
Subject: [PATCH] Fix float128-call.c test for power8 IEEE 128 and power10.
I built a compiler on a little endian power8 system where the default long
double was IEEE 128-bit instead of IBM 128-bit. I discovered that on
power8, we would generate a lxvd2x and xxpermdi to deal with the endianess
instead of the Altivec lxv.
In addition, I noticed the constant that was being loaded (1.0q) could be
loaded by the lxvkq instruction.
I rewrote the test to handle all forms of vector load and store that can
be generated. And I changed the constant to be one that lxvkq does not
support.
I did bootstrap tests on the following systems, and the the test ran in all
environments (each of the systems were configured for the cpu mentioned):
1) Little endian power9 with IBM 128-bit long double
2) Little endian power9 with IEEE 128-bit long double
3) Little endian power8 with IBM 128-bit long double
4) Little endian power8 with IEEE 128-bit long double
5) Little endian power10 with IBM 128-bit long double
6) Little endian power10 with IEEE 128-bit long double
7) Big endian power8 with IBM 128-bit long double
Can I check this patch into the master branch and later backport it to GCC-11?
2021-08-25 Michael Meissner <meiss...@linux.ibm.com>
gcc/testsuite/
* gcc.target/powerpc/float128-call.c: Fix test for IEEE 128-bit
long double and power10.
---
.../gcc.target/powerpc/float128-call.c | 27 +++++++++++++------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/gcc/testsuite/gcc.target/powerpc/float128-call.c
b/gcc/testsuite/gcc.target/powerpc/float128-call.c
index b64ffc68bfa..d1cf47e4298 100644
--- a/gcc/testsuite/gcc.target/powerpc/float128-call.c
+++ b/gcc/testsuite/gcc.target/powerpc/float128-call.c
@@ -6,22 +6,33 @@
#error "-mfloat128 is not supported."
#endif
+/* Pick a constant to load that cannot be generated by the power10 lxvkq
+ instruction. */
#ifdef __LONG_DOUBLE_IEEE128__
#define TYPE long double
-#define ONE 1.0L
+#define TEN 10.0L
#else
#define TYPE __float128
-#define ONE 1.0Q
+#define TEN 10.0Q
#endif
/* Test to make sure vector registers are used for passing IEEE 128-bit
floating point values and returning them. Also make sure the 'q' suffix is
- handled. */
-TYPE one (void) { return ONE; }
+ handled for __float128. */
+TYPE one (void) { return TEN; }
void store (TYPE a, TYPE *p) { *p = a; }
-/* { dg-final { scan-assembler {\mlxvd2x 34\M} {target be} } } */
-/* { dg-final { scan-assembler {\mstxvd2x 34\M} {target be} } } */
-/* { dg-final { scan-assembler {\mlvx 2\M} {target le} } } */
-/* { dg-final { scan-assembler {\mstvx 2\M} {target le} } } */
+/* This regexp captures the different vector load/stores that can be generated:
+
+ lxvd2x -- big endian power7/power8, little endian power8
+ lvx -- Altivec
+ lxv -- power9
+ plxv -- power10
+ lxvx -- X-form variant.
+ stxvd2x -- big endian power7/power8, little endian power8
+ stvx -- Altivec
+ lxvx -- power9/power10. */
+
+/* { dg-final { scan-assembler {\mlxvd2x 34\M|\mlvx 2\M|\mp?lxvx? 34\M} } } */
+/* { dg-final { scan-assembler {\mstxvd2x 34\M|\mstvx 2\M|\mstxvx 34\M} } } */
--
2.31.1
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.ibm.com, phone: +1 (978) 899-4797
