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