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8e0ed2340c
Summary: This change enables frame pointer elimination in non-leaf functions. The -fomit-frame-pointer option still needs to be used when compiling via clang (or an equivalent method of not setting the 'no-frame-pointer-elim*' function attributes if generating llvm IR via some other method) to take advantage of this optimization. This change should be NFC when compiling via clang without -fomit-frame-pointer. Reviewers: t.p.northover Subscribers: aemerson, rengolin, tberghammer, qcolombet, llvm-commits, danalbert, mcrosier, srhines Differential Revision: http://reviews.llvm.org/D17730 llvm-svn: 262495
27 lines
982 B
LLVM
27 lines
982 B
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios -relocation-model=pic -disable-fp-elim | FileCheck %s
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@__stack_chk_guard = external global i64*
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; PR20558
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; CHECK: adrp [[R0:x[0-9]+]], ___stack_chk_guard@GOTPAGE
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; CHECK: ldr [[R1:x[0-9]+]], {{\[}}[[R0]], ___stack_chk_guard@GOTPAGEOFF{{\]}}
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; CHECK: ldr [[R2:x[0-9]+]], {{\[}}[[R1]]{{\]}}
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; CHECK: stur [[R2]], {{\[}}x29, [[SLOT0:[0-9#\-]+]]{{\]}}
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; CHECK: ldur [[R3:x[0-9]+]], {{\[}}x29, [[SLOT0]]{{\]}}
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; CHECK: sub [[R4:x[0-9]+]], [[R2]], [[R3]]
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; CHECK: cbnz [[R4]], LBB
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define i32 @test_stack_guard_remat2() {
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entry:
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%StackGuardSlot = alloca i8*
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%StackGuard = load i8*, i8** bitcast (i64** @__stack_chk_guard to i8**)
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call void @llvm.stackprotector(i8* %StackGuard, i8** %StackGuardSlot)
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%container = alloca [32 x i8], align 1
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call void @llvm.stackprotectorcheck(i8** bitcast (i64** @__stack_chk_guard to i8**))
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ret i32 -1
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}
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declare void @llvm.stackprotector(i8*, i8**)
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declare void @llvm.stackprotectorcheck(i8**)
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