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c01de3fc6a
the prologue. Do not use basic blocks that have EFLAGS live-in as prologue if we need to realign the stack. Realigning the stack uses AND instruction and this clobbers EFLAGS. An other alternative would have been to save and restore EFLAGS around the stack realignment code, but this is likely inefficient. Fixes PR27531. llvm-svn: 267634
45 lines
1.7 KiB
LLVM
45 lines
1.7 KiB
LLVM
; RUN: llc %s -o - -enable-shrink-wrap=true | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
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; RUN: llc %s -o - -enable-shrink-wrap=false | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-pc-windows-msvc18.0.0"
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%struct.S = type { i32 }
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; Check that we do not use a basic block that has EFLAGS as live-in
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; if we need to realign the stack.
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; PR27531.
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; CHECK-LABEL: stackRealignment:
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; Prologue code.
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; CHECK: pushl
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; Make sure we actually perform some stack realignment.
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; CHECK: andl ${{[-0-9]+}}, %esp
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; This is the end of the entry block.
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; The prologue should have happened before that point because past
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; this point, EFLAGS is live.
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; CHECK: jg
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define x86_thiscallcc void @stackRealignment(%struct.S* %this) {
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entry:
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%data = alloca [1 x i32], align 4
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%d = alloca double, align 8
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%tmp = bitcast [1 x i32]* %data to i8*
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%arrayinit.begin = getelementptr inbounds [1 x i32], [1 x i32]* %data, i32 0, i32 0
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%x_ = getelementptr inbounds %struct.S, %struct.S* %this, i32 0, i32 0
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%tmp1 = load i32, i32* %x_, align 4
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%cmp = icmp sgt i32 %tmp1, 32
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%cond = select i1 %cmp, i32 42, i32 128
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store i32 %cond, i32* %arrayinit.begin, align 4
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%cmp3 = icmp slt i32 %tmp1, 32
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br i1 %cmp3, label %cleanup, label %if.end
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if.end: ; preds = %entry
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%tmp2 = bitcast double* %d to i8*
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call x86_thiscallcc void @bar(%struct.S* nonnull %this, i32* %arrayinit.begin, double* nonnull %d)
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br label %cleanup
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cleanup: ; preds = %if.end, %entry
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ret void
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}
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; Function Attrs: optsize
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declare x86_thiscallcc void @bar(%struct.S*, i32*, double*)
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