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ad3a898d94
We used to combine "sext(setcc x, y, cc) -> (select (setcc x, y, cc), -1, 0)" Instead, we should combine to (select (setcc x, y, cc), T, 0) where the value of T is 1 or -1, depending on the type of the setcc, and getBooleanContents() for the type if it is not i1. This fixes PR28504. llvm-svn: 277371
38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
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; The test case is rather involved, because we need to get to a state where
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; We have a sext(setcc x, y, cc) -> (select (setcc x, y, cc), T, 0) combine,
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; BUT this combine is only triggered post-legalization, so the setcc's return
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; type is i8. So we can't have the combine opportunity be exposed too early.
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; Basically, what we want to see is that the compare result zero-extended, and
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; then stored. Only one zext, and no sexts.
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; CHECK-LABEL: main:
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; CHECK: movzbl (%rdi), %[[EAX:.*]]
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; CHECK-NEXT: xorl %e[[C:.]]x, %e[[C]]x
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; CHECK-NEXT: cmpl $1, %[[EAX]]
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; CHECK-NEXT: sete %[[C]]l
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; CHECK-NEXT: movl %e[[C]]x, (%rsi)
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define void @main(i8* %p, i32* %q) {
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bb:
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%tmp4 = load i8, i8* %p, align 1
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%tmp5 = sext i8 %tmp4 to i32
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%tmp6 = load i8, i8* %p, align 1
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%tmp7 = zext i8 %tmp6 to i32
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%tmp8 = sub nsw i32 %tmp5, %tmp7
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%tmp11 = icmp eq i32 %tmp7, 1
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%tmp12 = zext i1 %tmp11 to i32
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%tmp13 = add nsw i32 %tmp8, %tmp12
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%tmp14 = trunc i32 %tmp13 to i8
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%tmp15 = sext i8 %tmp14 to i16
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%tmp16 = sext i16 %tmp15 to i32
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store i32 %tmp16, i32* %q, align 4
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br i1 %tmp11, label %bb21, label %bb22
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bb21: ; preds = %bb
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unreachable
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bb22: ; preds = %bb
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ret void
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}
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