CPUID functions are used to detect CPU features. If vector ISAs
are enabled, compiler is free to use them in these functions. Add
__attribute__ ((target("general-regs-only"))) to CPUID functions
to avoid vector instructions.
gcc/
PR target/101185
* config/i386/cpuid.h (__get_cpuid_max): Add
__attribute__ ((target("general-regs-only"))).
(__get_cpuid): Likewise.
(__get_cpuid_count): Likewise.
(__cpuidex): Likewise.
gcc/testsuite/
PR target/101185
* gcc.target/i386/avx512-check.h (check_osxsave): Add
__attribute__ ((target("general-regs-only"))).
(main): Likewise.
---
gcc/config/i386/cpuid.h | 4 ++++
gcc/testsuite/gcc.target/i386/avx512-check.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h
index aebc17c6827..74881ee91e5 100644
--- a/gcc/config/i386/cpuid.h
+++ b/gcc/config/i386/cpuid.h
@@ -243,6 +243,7 @@
pointer is non-null, then first four bytes of the signature
(as found in ebx register) are returned in location pointed by sig. */
+__attribute__ ((target("general-regs-only")))
static __inline unsigned int
__get_cpuid_max (unsigned int __ext, unsigned int *__sig)
{
@@ -298,6 +299,7 @@ __get_cpuid_max (unsigned int __ext, unsigned int *__sig)
supported and returns 1 for valid cpuid information or 0 for
unsupported cpuid leaf. All pointers are required to be non-null. */
+__attribute__ ((target("general-regs-only")))
static __inline int
__get_cpuid (unsigned int __leaf,
unsigned int *__eax, unsigned int *__ebx,
@@ -315,6 +317,7 @@ __get_cpuid (unsigned int __leaf,
/* Same as above, but sub-leaf can be specified. */
+__attribute__ ((target("general-regs-only")))
static __inline int
__get_cpuid_count (unsigned int __leaf, unsigned int __subleaf,
unsigned int *__eax, unsigned int *__ebx,
@@ -330,6 +333,7 @@ __get_cpuid_count (unsigned int __leaf, unsigned int
__subleaf,
return 1;
}
+__attribute__ ((target("general-regs-only")))
static __inline void
__cpuidex (int __cpuid_info[4], int __leaf, int __subleaf)
{
diff --git a/gcc/testsuite/gcc.target/i386/avx512-check.h
b/gcc/testsuite/gcc.target/i386/avx512-check.h
index 0a377dba1d5..406faf8fe03 100644
--- a/gcc/testsuite/gcc.target/i386/avx512-check.h
+++ b/gcc/testsuite/gcc.target/i386/avx512-check.h
@@ -25,6 +25,7 @@ do_test (void)
}
#endif
+__attribute__ ((target("general-regs-only")))
static int
check_osxsave (void)
{
@@ -34,6 +35,7 @@ check_osxsave (void)
return (ecx & bit_OSXSAVE) != 0;
}
+__attribute__ ((target("general-regs-only")))
int
main ()
{
--
2.31.1
