https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38592
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|fortran |tree-optimization
--- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I think the best place to fix this is in the middle-end.
Here is a C test case:
int yes()
{
char a[3];
__builtin_memmove (a, "yes", 3);
return __builtin_memcmp(a,"yes",3);
}
This generates a memcmp with current trunk:
.LC0:
.string "yes"
.text
.p2align 4,,15
.globl yes
.type yes, @function
yes:
.LFB0:
.cfi_startproc
subq $24, %rsp
.cfi_def_cfa_offset 32
movl $25977, %eax
movl $3, %edx
leaq 13(%rsp), %rdi
movl $.LC0, %esi
movw %ax, 13(%rsp)
movb $115, 15(%rsp)
call memcmp
addq $24, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE0:
.size yes, .-yes
.ident "GCC: (GNU) 8.0.0 20170730 (experimental)"
.section .note.GNU-stack,"",@progbits
