From 682d41a506dec31c24ea7c5e3440155ef8f6110b Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 24 Sep 2019 15:40:09 +0000
Subject: [PATCH] [X86] Add tests showing failure to stack fold MMX MOVD/MOVQ
 stores

llvm-svn: 372766
---
 llvm/test/CodeGen/X86/stack-folding-mmx.ll | 62 ++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/llvm/test/CodeGen/X86/stack-folding-mmx.ll b/llvm/test/CodeGen/X86/stack-folding-mmx.ll
index 071e73c..0214800 100644
--- a/llvm/test/CodeGen/X86/stack-folding-mmx.ll
+++ b/llvm/test/CodeGen/X86/stack-folding-mmx.ll
@@ -96,9 +96,71 @@ define x86_mmx @stack_fold_cvttps2pi(<4 x float> %a0) {
 declare x86_mmx @llvm.x86.sse.cvttps2pi(<4 x float>) nounwind readnone
 
 ; TODO stack_fold_movd_load
+
 ; TODO stack_fold_movd_store
+; padd forces execution on mmx
+define i32 @stack_fold_movd_store(x86_mmx %a0) nounwind {
+; CHECK-LABEL: stack_fold_movd_store:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    pushq %r15
+; CHECK-NEXT:    pushq %r14
+; CHECK-NEXT:    pushq %r13
+; CHECK-NEXT:    pushq %r12
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    paddb %mm0, %mm0
+; CHECK-NEXT:    movd %mm0, %eax
+; CHECK-NEXT:    movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
+; CHECK-NEXT:    #APP
+; CHECK-NEXT:    nop
+; CHECK-NEXT:    #NO_APP
+; CHECK-NEXT:    movl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Reload
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    popq %r12
+; CHECK-NEXT:    popq %r13
+; CHECK-NEXT:    popq %r14
+; CHECK-NEXT:    popq %r15
+; CHECK-NEXT:    popq %rbp
+; CHECK-NEXT:    retq
+  %1 = call x86_mmx @llvm.x86.mmx.padd.b(x86_mmx %a0, x86_mmx %a0)
+  %2 = bitcast x86_mmx %1 to <2 x i32>
+  %3 = extractelement <2 x i32> %2, i32 0
+  %4 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  ret i32 %3
+}
+
 ; TODO stack_fold_movq_load
+
 ; TODO stack_fold_movq_store
+; padd forces execution on mmx
+define i64 @stack_fold_movq_store(x86_mmx %a0) nounwind {
+; CHECK-LABEL: stack_fold_movq_store:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    pushq %r15
+; CHECK-NEXT:    pushq %r14
+; CHECK-NEXT:    pushq %r13
+; CHECK-NEXT:    pushq %r12
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    paddb %mm0, %mm0
+; CHECK-NEXT:    movq %mm0, %rax
+; CHECK-NEXT:    movq %rax, {{[-0-9]+}}(%r{{[sb]}}p) # 8-byte Spill
+; CHECK-NEXT:    #APP
+; CHECK-NEXT:    nop
+; CHECK-NEXT:    #NO_APP
+; CHECK-NEXT:    movq {{[-0-9]+}}(%r{{[sb]}}p), %rax # 8-byte Reload
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    popq %r12
+; CHECK-NEXT:    popq %r13
+; CHECK-NEXT:    popq %r14
+; CHECK-NEXT:    popq %r15
+; CHECK-NEXT:    popq %rbp
+; CHECK-NEXT:    retq
+  %1 = call x86_mmx @llvm.x86.mmx.padd.b(x86_mmx %a0, x86_mmx %a0)
+  %2 = bitcast x86_mmx %1 to i64
+  %3 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  ret i64 %2
+}
 
 define x86_mmx @stack_fold_pabsb(x86_mmx %a0) {
 ; CHECK-LABEL: stack_fold_pabsb:
-- 
2.7.4