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6b999dbbc0
This fixes PR22248 on s390x. The previous attempt at this was D19101, which was before LOAD_STACK_GUARD existed. Compared to the previous version, this always emits a rather ugly block of 4 instructions, involving a thread pointer load that can't be shared with other potential users. However, this is necessary for SSP - spilling the guard value (or thread pointer used to load it) is counter to the goal, since it could be overwritten along with the frame it protects. Differential Revision: http://reviews.llvm.org/D19363 llvm-svn: 267340
36 lines
1.0 KiB
LLVM
36 lines
1.0 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; CHECK-LABEL: @test_stack_guard
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; CHECK: ear [[REG1:%r[1-9][0-9]?]], %a0
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; CHECK: sllg [[REG1]], [[REG1]], 32
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; CHECK: ear [[REG1]], %a1
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; CHECK: lg [[REG1]], 40([[REG1]])
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; CHECK: stg [[REG1]], {{[0-9]*}}(%r15)
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; CHECK: brasl %r14, foo3@PLT
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; CHECK: ear [[REG2:%r[1-9][0-9]?]], %a0
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; CHECK: sllg [[REG2]], [[REG2]], 32
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; CHECK: ear [[REG2]], %a1
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; CHECK: lg [[REG2]], 40([[REG2]])
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; CHECK: sg [[REG2]], {{[0-9]*}}(%r15)
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define i32 @test_stack_guard() #0 {
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entry:
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%a1 = alloca [256 x i32], align 4
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%0 = bitcast [256 x i32]* %a1 to i8*
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call void @llvm.lifetime.start(i64 1024, i8* %0)
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%arraydecay = getelementptr inbounds [256 x i32], [256 x i32]* %a1, i64 0, i64 0
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call void @foo3(i32* %arraydecay)
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call void @llvm.lifetime.end(i64 1024, i8* %0)
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ret i32 0
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}
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; Function Attrs: nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture)
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declare void @foo3(i32*)
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; Function Attrs: nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture)
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attributes #0 = { sspstrong }
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