http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53759
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-06-24 CC| |areg.melikadamyan at gmail | |dot com, hjl.tools at gmail | |dot com, ubizjak at gmail | |dot com Target Milestone|--- |4.7.2 Summary|gcc -mavx emits vshufps for |[4.7/4.8 Regression] gcc |__builtin_ia32_loadlps |-mavx emits vshufps for | |__builtin_ia32_loadlps Ever Confirmed|0 |1 --- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-06-24 14:54:44 UTC --- GCC 4.6 doesn't have this problem: [hjl@gnu-6 pr53759]$ cat x.i typedef float v4sf __attribute__ ((vector_size (4*4))); typedef float v2sf __attribute__ ((vector_size (4*2))); v2sf mem[1]; int main() { v4sf reg = (v4sf){0,0,0,0}; reg = __builtin_ia32_loadlps(reg, mem); return reg[0]; } [hjl@gnu-6 pr53759]$ gcc -S -mavx -O x.i [hjl@gnu-6 pr53759]$ cat x.s .file "x.i" .text .globl main .type main, @function main: .LFB0: .cfi_startproc vxorps %xmm0, %xmm0, %xmm0 vmovlps mem(%rip), %xmm0, %xmm0 vcvttss2si %xmm0, %eax ret .cfi_endproc .LFE0: .size main, .-main .comm mem,8,8 .ident "GCC: (GNU) 4.6.3 20120306 (Red Hat 4.6.3-2)" .section .note.GNU-stack,"",@progbits [hjl@gnu-6 pr53759]$