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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 5d1ccdda7b0c625751661d50977f3dfbc73f8eae)
This commit is contained in:
Florian Weimer 2023-04-03 17:23:11 +02:00
parent 97ad4c64b9
commit 9cc2f41e52
2 changed files with 3 additions and 2 deletions
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1
NEWS
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@ -22,6 +22,7 @@ The following bugs are resolved with this release:
[30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
symlink for libraries without soname
[30151] gshadow: Matching sgetsgent, sgetsgent_r ERANGE handling
[30305] x86_64: Fix asm constraints in feraiseexcept
Version 2.37

4
sysdeps/x86_64/fpu/fraiseexcpt.c
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@ -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;
}