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[x86] Add the test for folding stack spills into pextrw.

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This is a negative test as pextrw doesn't write to all 32-bits of the
spilled GPR. This fold ended up happening when D32684 was landed and
covers the regression that motivated reverting it in r304762.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304763 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2017-06-06 02:16:01 +00:00
parent 565cfe059c
commit 446c2e7b47
1 changed files with 15 additions and 2 deletions
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17
test/CodeGen/X86/stack-folding-int-sse42.ll
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@ -453,6 +453,21 @@ declare <16 x i8> @llvm.x86.sse42.pcmpistrm128(<16 x i8>, <16 x i8>, i8) nounwin
; TODO stack_fold_pextrb
; We can't naively fold pextrw as it only writes to a 16-bit memory location
; even though it can store to a 32-bit register.
define i16 @stack_fold_pextrw(<8 x i16> %a0) {
; CHECK-LABEL: stack_fold_pextrw
; CHECK: pextrw $1, {{%xmm[0-9][0-9]*}}, %[[GPR32:(e[a-z]+|r[0-9]+d)]]
; CHECK: movl %[[GPR32]], {{-?[0-9]*}}(%rsp) {{.*#+}} 4-byte Spill
; CHECK: movl {{-?[0-9]*}}(%rsp), %eax {{.*#+}} 4-byte Reload
entry:
; add forces execution domain
%add = add <8 x i16> %a0, <i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7, i16 8>
%extract = extractelement <8 x i16> %add, i32 1
%asm = tail call <2 x i64> asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
ret i16 %extract
}
define i32 @stack_fold_pextrd(<4 x i32> %a0) {
;CHECK-LABEL: stack_fold_pextrd
;CHECK: pextrd $1, {{%xmm[0-9][0-9]*}}, {{-?[0-9]*}}(%rsp) {{.*#+}} 4-byte Folded Spill
@ -473,8 +488,6 @@ define i64 @stack_fold_pextrq(<2 x i64> %a0) {
ret i64 %1
}
; TODO stack_fold_pextrw
define <4 x i32> @stack_fold_phaddd(<4 x i32> %a0, <4 x i32> %a1) {
;CHECK-LABEL: stack_fold_phaddd
;CHECK: phaddd {{-?[0-9]*}}(%rsp), {{%xmm[0-9][0-9]*}} {{.*#+}} 16-byte Folded Reload