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cf082ae903
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llvm-svn: 186268
109 lines
3.0 KiB
LLVM
109 lines
3.0 KiB
LLVM
; RUN: opt -simplifycfg -S < %s | FileCheck %s
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define void @ifconvertstore(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
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entry:
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%arrayidx = getelementptr inbounds i32* %B, i64 0
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%0 = load i32* %arrayidx, align 4
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%add = add nsw i32 %0, %C
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%arrayidx2 = getelementptr inbounds i32* %A, i64 0
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; First store to the location.
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store i32 %add, i32* %arrayidx2, align 4
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%arrayidx4 = getelementptr inbounds i32* %B, i64 1
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%1 = load i32* %arrayidx4, align 4
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%add5 = add nsw i32 %1, %D
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%cmp6 = icmp sgt i32 %add5, %C
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br i1 %cmp6, label %if.then, label %ret.end
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; Make sure we speculate stores like the following one. It is cheap compared to
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; a mispredicated branch.
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; CHECK-LABEL: @ifconvertstore(
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; CHECK: %add5.add = select i1 %cmp6, i32 %add5, i32 %add
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; CHECK: store i32 %add5.add, i32* %arrayidx2, align 4
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if.then:
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store i32 %add5, i32* %arrayidx2, align 4
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br label %ret.end
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ret.end:
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ret void
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}
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define void @noifconvertstore1(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
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entry:
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%arrayidx = getelementptr inbounds i32* %B, i64 0
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%0 = load i32* %arrayidx, align 4
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%add = add nsw i32 %0, %C
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%arrayidx2 = getelementptr inbounds i32* %A, i64 0
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; Store to a different location.
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store i32 %add, i32* %arrayidx, align 4
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%arrayidx4 = getelementptr inbounds i32* %B, i64 1
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%1 = load i32* %arrayidx4, align 4
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%add5 = add nsw i32 %1, %D
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%cmp6 = icmp sgt i32 %add5, %C
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br i1 %cmp6, label %if.then, label %ret.end
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; CHECK-LABEL: @noifconvertstore1(
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; CHECK-NOT: select
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if.then:
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store i32 %add5, i32* %arrayidx2, align 4
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br label %ret.end
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ret.end:
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ret void
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}
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declare void @unknown_fun()
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define void @noifconvertstore2(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
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entry:
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%arrayidx = getelementptr inbounds i32* %B, i64 0
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%0 = load i32* %arrayidx, align 4
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%add = add nsw i32 %0, %C
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%arrayidx2 = getelementptr inbounds i32* %A, i64 0
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; First store to the location.
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store i32 %add, i32* %arrayidx2, align 4
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call void @unknown_fun()
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%arrayidx4 = getelementptr inbounds i32* %B, i64 1
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%1 = load i32* %arrayidx4, align 4
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%add5 = add nsw i32 %1, %D
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%cmp6 = icmp sgt i32 %add5, %C
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br i1 %cmp6, label %if.then, label %ret.end
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; CHECK-LABEL: @noifconvertstore2(
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; CHECK-NOT: select
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if.then:
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store i32 %add5, i32* %arrayidx2, align 4
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br label %ret.end
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ret.end:
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ret void
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}
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define void @noifconvertstore_volatile(i32 %m, i32* %A, i32* %B, i32 %C, i32 %D) {
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entry:
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%arrayidx = getelementptr inbounds i32* %B, i64 0
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%0 = load i32* %arrayidx, align 4
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%add = add nsw i32 %0, %C
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%arrayidx2 = getelementptr inbounds i32* %A, i64 0
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; First store to the location.
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store i32 %add, i32* %arrayidx2, align 4
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%arrayidx4 = getelementptr inbounds i32* %B, i64 1
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%1 = load i32* %arrayidx4, align 4
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%add5 = add nsw i32 %1, %D
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%cmp6 = icmp sgt i32 %add5, %C
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br i1 %cmp6, label %if.then, label %ret.end
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; Make sure we don't speculate volatile stores.
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; CHECK-LABEL: @noifconvertstore_volatile(
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; CHECK-NOT: select
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if.then:
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store volatile i32 %add5, i32* %arrayidx2, align 4
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br label %ret.end
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ret.end:
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ret void
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}
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