commit 5d1ccdda7b0c625751661d50977f3dfbc73f8eae Author: Florian Weimer Date: Mon Apr 3 17:23:11 2023 +0200 x86_64: Fix asm constraints in feraiseexcept (bug 30305) 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 Reviewed-by: Noah Goldstein diff --git a/sysdeps/x86_64/fpu/fraiseexcpt.c b/sysdeps/x86_64/fpu/fraiseexcpt.c index ca1c223053bf016b..fb886ed540b52100 100644 --- a/sysdeps/x86_64/fpu/fraiseexcpt.c +++ b/sysdeps/x86_64/fpu/fraiseexcpt.c @@ -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; }