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x86: Restore "*&" GCC asm memory operand workaround to installed fpu-control.h 

fpu_control.h is an installed header so a wider range of compiler versions
(including ones older than GCC 9) are relevant with it than are relevant
for building glibc.

Fixes commit 3014dec3ad
('x86: Remove obsolete "*&" GCC asm memory operand workaround')

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
This commit is contained in:
Uros Bizjak 2025-09-24 07:59:38 +02:00
parent 7ebac6bf94
commit a9a8b106bb
1 changed files with 3 additions and 3 deletions
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6
sysdeps/x86/fpu_control.h
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@ -89,7 +89,7 @@
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
/* Macros for accessing the hardware control word. "" is used to
/* Macros for accessing the hardware control word. "*&" is used to
work around a bug in older versions of GCC. __volatile__ is used
to support combination of writing the control register and reading
it back. Without __volatile__, the old value may be used for reading
@ -99,8 +99,8 @@ typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
recent hardware nor on x86-64. Some floating point operations are
executed in the SSE/SSE2 engines which have their own control and
status register. */
#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (cw))
#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (cw))
#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (*&cw))
#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;