1 ; RUN: llc -mtriple=x86_64-unknown-linux-gnu -enable-misched=false < %s | FileCheck %s 2 3 define i32 @fold64to32(i64 %add, i32 %spill) { 4 ; CHECK-LABEL: fold64to32: 5 ; CHECK: movq %rdi, -{{[0-9]+}}(%rsp) # 8-byte Spill 6 ; CHECK: subl -{{[0-9]+}}(%rsp), %esi # 4-byte Folded Reload 7 entry: 8 tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() 9 %trunc = trunc i64 %add to i32 10 %sub = sub i32 %spill, %trunc 11 ret i32 %sub 12 } 13 14 define i8 @fold64to8(i64 %add, i8 %spill) { 15 ; CHECK-LABEL: fold64to8: 16 ; CHECK: movq %rdi, -{{[0-9]+}}(%rsp) # 8-byte Spill 17 ; CHECK: subb -{{[0-9]+}}(%rsp), %sil # 1-byte Folded Reload 18 entry: 19 tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() 20 %trunc = trunc i64 %add to i8 21 %sub = sub i8 %spill, %trunc 22 ret i8 %sub 23 } 24 25 ; Do not fold a 4-byte store into a 8-byte spill slot 26 ; CHECK-LABEL: nofold 27 ; CHECK: movq %rsi, -{{[0-9]+}}(%rsp) # 8-byte Spill 28 ; CHECK: movq -{{[0-9]+}}(%rsp), %rax # 8-byte Reload 29 ; CHECK: subl %edi, %eax 30 ; CHECK: movq %rax, -{{[0-9]+}}(%rsp) # 8-byte Spill 31 ; CHECK: movq -{{[0-9]+}}(%rsp), %rax # 8-byte Reload 32 define i32 @nofold(i64 %add, i64 %spill) { 33 entry: 34 tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() 35 %trunc = trunc i64 %add to i32 36 %truncspill = trunc i64 %spill to i32 37 %sub = sub i32 %truncspill, %trunc 38 tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() 39 ret i32 %sub 40 } 41 42
