diff options
Diffstat (limited to 'llvm/test/Transforms/InstCombine/zext-phi.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/zext-phi.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/zext-phi.ll b/llvm/test/Transforms/InstCombine/zext-phi.ll new file mode 100644 index 00000000000..5e352415c74 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/zext-phi.ll @@ -0,0 +1,32 @@ +; RUN: opt < %s -instcombine -S | FileCheck %s + +target datalayout = "e-m:e-i64:64-n8:16:32:64" + +; Although i1 is not in the datalayout, we should treat it +; as a legal type because it is a fundamental type in IR. +; This means we should shrink the phi (sink the zexts). + +define i64 @sink_i1_casts(i1 %cond1, i1 %cond2) { +; CHECK-LABEL: @sink_i1_casts( +; CHECK-NEXT: entry: +; CHECK-NEXT: br i1 %cond1, label %if, label %end +; CHECK: if: +; CHECK-NEXT: br label %end +; CHECK: end: +; CHECK-NEXT: [[PHI_IN:%.*]] = phi i1 [ %cond1, %entry ], [ %cond2, %if ] +; CHECK-NEXT: [[PHI:%.*]] = zext i1 [[PHI_IN]] to i64 +; CHECK-NEXT: ret i64 [[PHI]] +; +entry: + %z1 = zext i1 %cond1 to i64 + br i1 %cond1, label %if, label %end + +if: + %z2 = zext i1 %cond2 to i64 + br label %end + +end: + %phi = phi i64 [ %z1, %entry ], [ %z2, %if ] + ret i64 %phi +} + |
