33 lines
862 B
LLVM
33 lines
862 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-n8:16:32:64"
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; Although i1 is not in the datalayout, we should treat it
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; as a legal type because it is a fundamental type in IR.
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; This means we should shrink the phi (sink the zexts).
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define i64 @sink_i1_casts(i1 %cond1, i1 %cond2) {
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; CHECK-LABEL: @sink_i1_casts(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond1, label %if, label %end
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; CHECK: if:
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; CHECK-NEXT: br label %end
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; CHECK: end:
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; CHECK-NEXT: [[PHI_IN:%.*]] = phi i1 [ %cond1, %entry ], [ %cond2, %if ]
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; CHECK-NEXT: [[PHI:%.*]] = zext i1 [[PHI_IN]] to i64
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; CHECK-NEXT: ret i64 [[PHI]]
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;
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entry:
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%z1 = zext i1 %cond1 to i64
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br i1 %cond1, label %if, label %end
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if:
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%z2 = zext i1 %cond2 to i64
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br label %end
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end:
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%phi = phi i64 [ %z1, %entry ], [ %z2, %if ]
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ret i64 %phi
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}
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