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1; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA2; RUN: llc -enable-ipra < %s | FileCheck %s3 4target triple = "x86_64--"5 6define 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 %r1510; When IPRA is enabled none register should be saved as foo() is local function11; so we optimize it to save no registers.12; CHECK-LABEL: foo:13; CHECK-NOT: pushq %r1514 call void asm sideeffect "movl %r14d, %r15d", "~{r15}"()15 ret void16}17 18define 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 be21 ; saved if register containing orignal value is also getting clobbered22 ; and reloaded after foo(), here original value is loaded back into R15D after23 ; call to foo.24 call void @foo()25 ; CHECK-LABEL: bar:26 ; CHECK: callq foo27 ; CHECK-NEXT: movl %edi, %r15d28 call void asm sideeffect "movl $0, %r12d", "{r15}~{r12}"(i32 %X)29 ret void30}31