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x86_64: Fix asm constraints in feraiseexcept (bug 30305)

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The divss instruction clobbers its first argument, and the constraints
need to reflect that.  Fortunately, with GCC 12, generated code does
not actually change, so there is no externally visible bug.

Suggested-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 5d1ccdda7b)
This commit is contained in:
Florian Weimer 2023-04-03 17:23:11 +02:00
parent 6d42a86ad3
commit 95c5bddc9f
2 changed files with 3 additions and 2 deletions
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1
NEWS
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@ -56,6 +56,7 @@ The following bugs are resolved with this release:
[29951] time: Set daylight to 1 for matching DST/offset change
[30053] time: strftime %s returns -1 after 2038 on 32 bits systems
[30151] gshadow: Matching sgetsgent, sgetsgent_r ERANGE handling
[30305] x86_64: Fix asm constraints in feraiseexcept
Version 2.36

4
sysdeps/x86_64/fpu/fraiseexcpt.c
View File

@ -33,7 +33,7 @@ __feraiseexcept (int excepts)
/* One example of an invalid operation is 0.0 / 0.0. */
float f = 0.0;
__asm__ __volatile__ ("divss %0, %0 " : : "x" (f));
__asm__ __volatile__ ("divss %0, %0 " : "+x" (f));
(void) &f;
}
@ -43,7 +43,7 @@ __feraiseexcept (int excepts)
float f = 1.0;
float g = 0.0;
__asm__ __volatile__ ("divss %1, %0" : : "x" (f), "x" (g));
__asm__ __volatile__ ("divss %1, %0" : "+x" (f) : "x" (g));
(void) &f;
}