https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101809
Bug ID: 101809
Summary: emulated gather capability doesn't support 32-bit
target
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: crazylht at gmail dot com, rguenth at gcc dot gnu.org
Target Milestone: ---
On Linux/x86-64, I get
[hjl@gnu-cfl-2 xxx]$ cat x.c
#include <stdint.h>
#define loop_t uint32_t
#define idx_t uint32_t
void loop(double * const __restrict__ dst,
double const * const __restrict__ src,
idx_t const * const __restrict__ idx,
loop_t const begin,
loop_t const end)
{
for (loop_t i = begin; i < end; ++i)
dst[i] = 42.0 * src[idx[i]];
}
[hjl@gnu-cfl-2 xxx]$ make x.s
/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/ -O3
-m32 -march=x86-64 -mfpmath=sse -S x.c
[hjl@gnu-cfl-2 xxx]$ cat x.s
.file "x.c"
.text
.p2align 4
.globl loop
.type loop, @function
loop:
.LFB0:
.cfi_startproc
pushl %edi
.cfi_def_cfa_offset 8
.cfi_offset 7, -8
pushl %esi
.cfi_def_cfa_offset 12
.cfi_offset 6, -12
pushl %ebx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
movl 28(%esp), %eax
movl 32(%esp), %ecx
movl 16(%esp), %ebx
movl 20(%esp), %esi
movl 24(%esp), %edi
cmpl %ecx, %eax
jnb .L1
movsd .LC0, %xmm1
.p2align 4,,10
.p2align 3
.L3:
movl (%edi,%eax,4), %edx
movsd (%esi,%edx,8), %xmm0
mulsd %xmm1, %xmm0
movsd %xmm0, (%ebx,%eax,8)
addl $1, %eax
cmpl %eax, %ecx
jne .L3
.L1:
popl %ebx
.cfi_restore 3
.cfi_def_cfa_offset 12
popl %esi
.cfi_restore 6
.cfi_def_cfa_offset 8
popl %edi
.cfi_restore 7
.cfi_def_cfa_offset 4
ret
.cfi_endproc
.LFE0:
.size loop, .-loop
.section .rodata.cst8,"aM",@progbits,8
.align 8
.LC0:
.long 0
.long 1078263808
.ident "GCC: (GNU) 12.0.0 20210806 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-2 xxx]$
emulated gather capability isn't enabled.
