eb7d16ea25
mflr is kind of expensive on Power version smaller than 10, so we should schedule the store for the mflr's def away from mflr. In epilogue, the expensive mtlr has no user for its def, so it doesn't matter that the load and the mtlr are back-to-back. Reviewed By: RolandF Differential Revision: https://reviews.llvm.org/D137423
35 lines
924 B
LLVM
35 lines
924 B
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc-unknown-linux-gnu | FileCheck %s -check-prefix=PPC32
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; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu | FileCheck %s -check-prefix=PPC64
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; PPC32: foo
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; PPC32: mflr 0
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; PPC32: stwu 1, -[[STACK:[0-9]+]](1)
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; PPC32: stw 0, 20(1)
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; PPC32: lwz [[REG:[0-9]+]], [[RETADDR:[0-9]+]](1)
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; PPC32: stw [[REG]], 0(3)
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; PPC32: lwz 0, [[RETADDR]](1)
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; PPC32: addi 1, 1, [[STACK]]
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; PPC32: mtlr 0
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; PPC32: blr
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; PPC64: foo
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; PPC64: mflr 0
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; PPC64: stdu 1, -[[#%d,STACK:]]
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; PPC64: std 0, [[#%d,RETADDR:]]
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; PPC64: ld [[REG:[0-9]+]]
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; PPC64: std [[REG]], 0(3)
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; PPC64: addi 1, 1, [[#%d,STACK]]
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; PPC64: ld 0, [[#%d,RETADDR-STACK]]
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; PPC64: mtlr 0
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; PPC64: blr
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define void @foo(ptr %X) nounwind {
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entry:
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%tmp = tail call ptr @llvm.returnaddress( i32 0 ) ; <ptr> [#uses=1]
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store ptr %tmp, ptr %X, align 4
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ret void
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}
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declare ptr @llvm.returnaddress(i32)
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