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c1cf1864f4
value is a pointer. This patch is to fix PR30213. When expanding an expr based on ValueOffsetPair, if the value is of pointer type, we can only create a getelementptr instead of sub expr. Differential Revision: https://reviews.llvm.org/D24088 llvm-svn: 281439
37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; PR30213. Check scev expand will generate correct code if the value
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; in ValueOffsetPair is of pointer type.
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; RUN: opt -mtriple=i386-apple-macosx10.12.0 < %s -loop-reduce -S | FileCheck %s
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; CHECK: %ptr4.ptr1 = select i1 %cmp.i, i8* %ptr4, i8* %ptr1
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; CHECK-NEXT: %scevgep = getelementptr i8, i8* %ptr4.ptr1, i32 1
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; CHECK-NEXT: br label %while.cond.i
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target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
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target triple = "i386-apple-macosx10.12.0"
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; Function Attrs: nounwind optsize ssp
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define void @Foo() {
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entry:
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switch i2 undef, label %sw.epilog102 [
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i2 -2, label %sw.bb28
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]
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sw.bb28: ; preds = %entry
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%0 = load i8*, i8** undef, align 2
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%ptr1 = getelementptr inbounds i8, i8* undef, i32 -1
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%ptr4 = getelementptr inbounds i8, i8* %0, i32 -1
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%cmp.i = icmp ult i8* undef, %0
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%ptr4.ptr1 = select i1 %cmp.i, i8* %ptr4, i8* %ptr1
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br label %while.cond.i
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while.cond.i: ; preds = %while.cond.i, %sw.bb28
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%currPtr.1.i = phi i8* [ %incdec.ptr.i, %while.cond.i ], [ %ptr4.ptr1, %sw.bb28 ]
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%incdec.ptr.i = getelementptr inbounds i8, i8* %currPtr.1.i, i32 1
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%1 = load i8, i8* %incdec.ptr.i, align 1
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br label %while.cond.i
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sw.epilog102: ; preds = %entry
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unreachable
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}
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