https://gcc.gnu.org/g:1205104bbef40abe3baa5965a676f3b0f68971dd
commit r14-10476-g1205104bbef40abe3baa5965a676f3b0f68971dd
Author: René Rebe <r...@exactcode.de>
Date: Fri Jul 12 21:17:08 2024 +0000
rs6000: Fix .machine cpu selection w/ altivec [PR97367]
There are various non-IBM CPUs with altivec, so we cannot use that
flag to determine which .machine cpu to use, so ignore it.
Emit an additional ".machine altivec" if Altivec is enabled so
that the assembler doesn't require an explicit -maltivec option
to assemble any Altivec instructions for those targets where
the ".machine cpu" is insufficient to enable Altivec. For example,
-mcpu=G5 emits a ".machine power4".
2024-07-18 René Rebe <r...@exactcode.de>
Peter Bergner <berg...@linux.ibm.com>
gcc/
PR target/97367
* config/rs6000/rs6000.cc (rs6000_machine_from_flags): Do not
consider
OPTION_MASK_ALTIVEC.
(emit_asm_machine): For Altivec compiles, emit a ".machine altivec".
gcc/testsuite/
PR target/97367
* gcc.target/powerpc/pr97367.c: New test.
Signed-off-by: René Rebe <r...@exactcode.de>
(cherry picked from commit 6962835bca3e6bef0f6ceae84a7814138b08b8a5)
Diff:
---
gcc/config/rs6000/rs6000.cc | 5 ++++-
gcc/testsuite/gcc.target/powerpc/pr97367.c | 13 +++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 11cb622fe1f1..7b80c98cfd83 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -5869,7 +5869,8 @@ rs6000_machine_from_flags (void)
HOST_WIDE_INT flags = rs6000_isa_flags;
/* Disable the flags that should never influence the .machine selection. */
- flags &= ~(OPTION_MASK_PPC_GFXOPT | OPTION_MASK_PPC_GPOPT |
OPTION_MASK_ISEL);
+ flags &= ~(OPTION_MASK_PPC_GFXOPT | OPTION_MASK_PPC_GPOPT | OPTION_MASK_ISEL
+ | OPTION_MASK_ALTIVEC);
if ((flags & (ISA_3_1_MASKS_SERVER & ~ISA_3_0_MASKS_SERVER)) != 0)
return "power10";
@@ -5894,6 +5895,8 @@ void
emit_asm_machine (void)
{
fprintf (asm_out_file, "\t.machine %s\n", rs6000_machine);
+ if (TARGET_ALTIVEC)
+ fprintf (asm_out_file, "\t.machine altivec\n");
}
#endif
diff --git a/gcc/testsuite/gcc.target/powerpc/pr97367.c
b/gcc/testsuite/gcc.target/powerpc/pr97367.c
new file mode 100644
index 000000000000..ef269a5f9134
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr97367.c
@@ -0,0 +1,13 @@
+/* PR target/97367 */
+/* { dg-options "-mdejagnu-cpu=G5" } */
+
+/* Verify we emit a ".machine power4" and ".machine altivec" rather
+ than a ".machine power7". */
+
+int dummy (void)
+{
+ return 0;
+}
+
+/* { dg-final { scan-assembler {\.machine power4\M} } } */
+/* { dg-final { scan-assembler {\.machine altivec\M} } } */
