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f7cfdf8b26
We rely on HasOpaqueSPAdjustment not changing after we've calculated things based on it. Things like whether or not we can use 'rep;movs' to copy bytes around, that sort of thing. If it changes, invariants in the backend will quietly break. This situation arose when we had a call to memcpy *and* a COPY of the FLAGS register where we would attempt to reference local variables using %esi, a register that was clobbered by the 'rep;movs'. This fixes PR26124. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257730 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.5 KiB
LLVM
54 lines
1.5 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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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.T = type { i64, [3 x i32] }
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; Function Attrs: nounwind optsize
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define void @f(i8* %p, i8* %q, i32* inalloca nocapture %unused) #0 {
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entry:
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%g = alloca %struct.T, align 8
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%r = alloca i32, align 8
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store i32 0, i32* %r, align 4
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %p, i8* %q, i32 24, i32 8, i1 false)
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br label %while.body
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while.body: ; preds = %while.body, %entry
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%load = load i32, i32* %r, align 4
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%dec = add nsw i32 %load, -1
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store i32 %dec, i32* %r, align 4
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call void @g(%struct.T* %g)
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body
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ret void
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i32, i1) #1
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declare void @g(%struct.T*)
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; CHECK-LABEL: _f:
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; CHECK: pushl %ebp
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; CHECK: movl %esp, %ebp
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; CHECK: andl $-8, %esp
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; CHECK-NOT: movl %esp, %esi
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; CHECK: rep;movsl
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; CHECK: leal 8(%esp), %esi
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; CHECK: decl (%esp)
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; CHECK: seto %al
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; CHECK: lahf
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; CHECK: movl %eax, %edi
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; CHECK: pushl %esi
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; CHECK: calll _g
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; CHECK: addl $4, %esp
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; CHECK: movl %edi, %eax
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; CHECK: addb $127, %al
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; CHECK: sahf
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attributes #0 = { nounwind optsize }
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attributes #1 = { argmemonly nounwind }
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