| ; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA |
| ; RUN: llc -enable-ipra < %s | FileCheck %s |
| |
| target triple = "x86_64--" |
| |
| define internal void @foo() norecurse { |
| ; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg. |
| ; NOIPRA-LABEL: foo: |
| ; NOIPRA: pushq %r15 |
| ; When IPRA is enabled none register should be saved as foo() is local function |
| ; so we optimize it to save no registers. |
| ; CHECK-LABEL: foo: |
| ; CHECK-NOT: pushq %r15 |
| call void asm sideeffect "movl %r14d, %r15d", "~{r15}"() |
| ret void |
| } |
| |
| define void @bar(i32 %X) { |
| call void asm sideeffect "movl %r12d, $0", "{r15}~{r12}"(i32 %X) |
| ; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be |
| ; saved if register containing orignal value is also getting clobbered |
| ; and reloaded after foo(), here original value is loaded back into R15D after |
| ; call to foo. |
| call void @foo() |
| ; CHECK-LABEL: bar: |
| ; CHECK: callq foo |
| ; CHECK-NEXT: movl %eax, %r15d |
| call void asm sideeffect "movl $0, %r12d", "{r15}~{r12}"(i32 %X) |
| ret void |
| } |