https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89040
Bug ID: 89040
Summary: Wrong code with -mno-mmx
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-cfl-1 gcc]$ cat /tmp/3.i
typedef int __m64 __attribute__ ((__vector_size__ (8), __may_alias__));
typedef int __m64_u __attribute__ ((__vector_size__ (8), __may_alias__,
__aligned__ (1)));
typedef int __v2si __attribute__ ((__vector_size__ (8)));
typedef short __v4hi __attribute__ ((__vector_size__ (8)));
typedef char __v8qi __attribute__ ((__vector_size__ (8)));
typedef long long __v1di __attribute__ ((__vector_size__ (8)));
typedef float __v2sf __attribute__ ((__vector_size__ (8)));
int
foo3b (__m64 __i)
{
return ((__v2si)__i)[0];
}
[hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -S -O2 /tmp/3.i -mno-mmx
[hjl@gnu-cfl-1 gcc]$ cat 3.s
.file "3.i"
.text
.p2align 4
.globl foo3b
.type foo3b, @function
foo3b:
.LFB0:
.cfi_startproc
movq %xmm0, %rax <<<<<<<< This should be "movd %xmm0, %eax".
ret
.cfi_endproc
.LFE0:
.size foo3b, .-foo3b
.ident "GCC: (GNU) 9.0.1 20190123 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 gcc]$
