| ; RUN: llc -mtriple=x86_64-unknown-linux-gnu -enable-misched=false < %s | FileCheck %s |
| |
| define i32 @fold64to32(i64 %add, i32 %spill) { |
| ; CHECK-LABEL: fold64to32: |
| ; CHECK: movq %rdi, -{{[0-9]+}}(%rsp) # 8-byte Spill |
| ; CHECK: subl -{{[0-9]+}}(%rsp), %esi # 4-byte Folded Reload |
| entry: |
| tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() |
| %trunc = trunc i64 %add to i32 |
| %sub = sub i32 %spill, %trunc |
| ret i32 %sub |
| } |
| |
| define i8 @fold64to8(i64 %add, i8 %spill) { |
| ; CHECK-LABEL: fold64to8: |
| ; CHECK: movq %rdi, -{{[0-9]+}}(%rsp) # 8-byte Spill |
| ; CHECK: subb -{{[0-9]+}}(%rsp), %sil # 1-byte Folded Reload |
| entry: |
| tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() |
| %trunc = trunc i64 %add to i8 |
| %sub = sub i8 %spill, %trunc |
| ret i8 %sub |
| } |
| |
| ; Do not fold a 4-byte store into a 8-byte spill slot |
| ; CHECK-LABEL: nofold |
| ; CHECK: movq %rsi, -{{[0-9]+}}(%rsp) # 8-byte Spill |
| ; CHECK: movq -{{[0-9]+}}(%rsp), %rax # 8-byte Reload |
| ; CHECK: subl %edi, %eax |
| ; CHECK: movq %rax, -{{[0-9]+}}(%rsp) # 8-byte Spill |
| ; CHECK: movq -{{[0-9]+}}(%rsp), %rax # 8-byte Reload |
| define i32 @nofold(i64 %add, i64 %spill) { |
| entry: |
| tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() |
| %trunc = trunc i64 %add to i32 |
| %truncspill = trunc i64 %spill to i32 |
| %sub = sub i32 %truncspill, %trunc |
| tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() |
| ret i32 %sub |
| } |
| |
