1 ; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA 2 ; RUN: llc -enable-ipra < %s | FileCheck %s 3 4 target triple = "x86_64--" 5 6 define internal void @foo() norecurse { 7 ; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg. 8 ; NOIPRA-LABEL: foo: 9 ; NOIPRA: pushq %r15 10 ; When IPRA is enabled none register should be saved as foo() is local function 11 ; so we optimize it to save no registers. 12 ; CHECK-LABEL: foo: 13 ; CHECK-NOT: pushq %r15 14 call void asm sideeffect "movl %r14d, %r15d", "~{r15}"() 15 ret void 16 } 17 18 define void @bar(i32 %X) { 19 call void asm sideeffect "movl %r12d, $0", "{r15}~{r12}"(i32 %X) 20 ; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be 21 ; saved if register containing orignal value is also getting clobbered 22 ; and reloaded after foo(), here original value is loaded back into R15D after 23 ; call to foo. 24 call void @foo() 25 ; CHECK-LABEL: bar: 26 ; CHECK: callq foo 27 ; CHECK-NEXT: movl %eax, %r15d 28 call void asm sideeffect "movl $0, %r12d", "{r15}~{r12}"(i32 %X) 29 ret void 30 } 31
