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* [gcc(refs/users/meissner/heads/work065)] Fix float128-call.c test for power8 IEEE 128 and power10.
@ 2021-08-25 4:39 Michael Meissner
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From: Michael Meissner @ 2021-08-25 4:39 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:4ee566a1dc593c4b68d84c01dac34f0591b15717
commit 4ee566a1dc593c4b68d84c01dac34f0591b15717
Author: Michael Meissner <meissner@linux.ibm.com>
Date: Wed Aug 25 00:39:08 2021 -0400
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.
2021-08-25 Michael Meissner <meissner@linux.ibm.com>
gcc/testsuite/
* gcc.target/powerpc/float128-call.c: Fix test for IEEE 128-bit
long double and power10.
Diff:
---
gcc/testsuite/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} } } */
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