https://bugs.llvm.org/show_bug.cgi?id=42755
Bug ID: 42755
Summary: [SLPVectorizer] Failure to use vectorize integer
minimum loop
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
Current codegen: https://gcc.godbolt.org/z/smAJKe
#include <x86intrin.h>
auto minmaxi(__v4si x, __v4si min) {
for (int i = 0; i != 4; ++i)
if (x[i] < min[i])
min[i] = x[i];
return min;
}
_Z7minmaxiDv4_iS_:
vmovd %xmm0, %eax
vmovd %xmm1, %ecx
cmpl %ecx, %eax
jl .LBB0_1
vpextrd $1, %xmm0, %eax
vpextrd $1, %xmm1, %ecx
cmpl %ecx, %eax
jl .LBB0_3
.LBB0_4:
vpextrd $2, %xmm0, %eax
vpextrd $2, %xmm1, %ecx
cmpl %ecx, %eax
jl .LBB0_5
.LBB0_6:
vpextrd $3, %xmm0, %eax
vpextrd $3, %xmm1, %ecx
cmpl %ecx, %eax
jl .LBB0_7
.LBB0_8:
vmovdqa %xmm1, %xmm0
retq
.LBB0_1:
vpblendw $3, %xmm0, %xmm1, %xmm1 # xmm1 =
xmm0[0,1],xmm1[2,3,4,5,6,7]
vpextrd $1, %xmm0, %eax
vpextrd $1, %xmm1, %ecx
cmpl %ecx, %eax
jge .LBB0_4
.LBB0_3:
vpblendw $12, %xmm0, %xmm1, %xmm1 # xmm1 =
xmm1[0,1],xmm0[2,3],xmm1[4,5,6,7]
vpextrd $2, %xmm0, %eax
vpextrd $2, %xmm1, %ecx
cmpl %ecx, %eax
jge .LBB0_6
.LBB0_5:
vpblendw $48, %xmm0, %xmm1, %xmm1 # xmm1 =
xmm1[0,1,2,3],xmm0[4,5],xmm1[6,7]
vpextrd $3, %xmm0, %eax
vpextrd $3, %xmm1, %ecx
cmpl %ecx, %eax
jge .LBB0_8
.LBB0_7:
vpblendw $192, %xmm0, %xmm1, %xmm1 # xmm1 =
xmm1[0,1,2,3,4,5],xmm0[6,7]
vmovdqa %xmm1, %xmm0
retq
--
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