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b923ade46b
be propagated to all its users, and this propagation could increase the probability of finding common subexpressions. If the COPY has only one user, the COPY itself can be removed. llvm-svn: 215344
46 lines
1.0 KiB
LLVM
46 lines
1.0 KiB
LLVM
; RUN: llc < %s -mtriple=aarch64-linux-gnuabi -O2 | FileCheck %s
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; marked as external to prevent possible optimizations
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@a = external global i32
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@b = external global i32
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@c = external global i32
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@d = external global i32
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@e = external global i32
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define void @combine-sign-comparisons-by-cse(i32 *%arg) {
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; CHECK: cmp
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; CHECK: b.ge
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; CHECK-NOT: cmp
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; CHECK: b.le
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entry:
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%a = load i32* @a, align 4
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%b = load i32* @b, align 4
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%c = load i32* @c, align 4
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%d = load i32* @d, align 4
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%e = load i32* @e, align 4
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%cmp = icmp slt i32 %a, %e
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true:
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%cmp1 = icmp eq i32 %b, %c
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br i1 %cmp1, label %return, label %if.end
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lor.lhs.false:
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%cmp2 = icmp sgt i32 %a, %e
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3:
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%cmp4 = icmp eq i32 %b, %d
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br i1 %cmp4, label %return, label %if.end
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if.end:
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br label %return
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return:
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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store i32 %a, i32 *%arg
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ret void
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}
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