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.

2021-08-27  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 --git a/gcc/testsuite/gcc.target/powerpc/float128-call.c b/gcc/testsuite/gcc.target/powerpc/float128-call.c
index b64ffc68bfaa52f7e4714a0b63207863fdc10bf9..44b242b5dc6399d9f7d512d2f54fc9a0a9c8c6e5 100644 (file)
--- 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
+       stxvx   -- 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} } } */