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From: "bero at arklinux dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug inline-asm/20202] New: asm("movq %0, %mm0" : : "X"(*a)) generates invalid asm code Date: Fri, 25 Feb 2005 08:43:00 -0000 [thread overview] Message-ID: <20050225002917.20202.bero@arklinux.org> (raw) Compiling the following code results in invalid asm: #include <stdint.h> typedef union { int64_t q; } __attribute__ ((aligned (8))) mmx_t; int main(int argc, char **argv) { mmx_t a; mmx_t *b=&a; __asm__ __volatile__("movq %0, %%mm0" : : "X" (*b)); /* produces invalid asm code */ } The equivalent #include <stdint.h> typedef union { int64_t q; } __attribute__ ((aligned (8))) mmx_t; int main(int argc, char **argv) { mmx_t a; __asm__ __volatile__("movq %0, %%mm0" : : "X" (a)); /* works */ } works. The invalid asm code being generated is "movq %eax,%mm0". -- Summary: asm("movq %0, %mm0" : : "X"(*a)) generates invalid asm code Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: inline-asm AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: bero at arklinux dot org CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-ark-linux GCC host triplet: i686-ark-linux GCC target triplet: i686-ark-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20202
next reply other threads:[~2005-02-25 0:29 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-02-25 8:43 bero at arklinux dot org [this message] 2005-02-25 9:13 ` [Bug inline-asm/20202] " bero at arklinux dot org 2005-02-25 20:44 ` pinskia at gcc dot gnu dot org
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