[llvm] 279ff0f - [InstCombine] Add test where op of phi simplifies to phi (NFC)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 4 06:10:13 PDT 2022
Author: Nikita Popov
Date: 2022-10-04T15:10:02+02:00
New Revision: 279ff0f8ee19aeb2c71a1dc27e1b798da73963b0
URL: https://github.com/llvm/llvm-project/commit/279ff0f8ee19aeb2c71a1dc27e1b798da73963b0
DIFF: https://github.com/llvm/llvm-project/commit/279ff0f8ee19aeb2c71a1dc27e1b798da73963b0.diff
LOG: [InstCombine] Add test where op of phi simplifies to phi (NFC)
Degenerate case for D134954.
Added:
Modified:
llvm/test/Transforms/InstCombine/phi.ll
Removed:
################################################################################
diff --git a/llvm/test/Transforms/InstCombine/phi.ll b/llvm/test/Transforms/InstCombine/phi.ll
index df5e17421091..dac6eb34876f 100644
--- a/llvm/test/Transforms/InstCombine/phi.ll
+++ b/llvm/test/Transforms/InstCombine/phi.ll
@@ -1315,3 +1315,27 @@ exit:
%res = phi i1 [ true, %start ], [ %and, %loop ]
ret i1 %res
}
+
+declare void @use(i32)
+
+define i32 @phi_op_self_simplify() {
+; CHECK-LABEL: @phi_op_self_simplify(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_ADD2:%.*]], [[LOOP]] ]
+; CHECK-NEXT: [[IV_ADD:%.*]] = xor i32 [[IV]], -1
+; CHECK-NEXT: call void @use(i32 [[IV_ADD]])
+; CHECK-NEXT: [[IV_ADD2]] = xor i32 [[IV]], -1
+; CHECK-NEXT: br label [[LOOP]]
+;
+entry:
+ br label %loop
+
+loop:
+ %iv = phi i32 [ 1, %entry ], [ %iv.add2, %loop ]
+ %iv.add = xor i32 %iv, -1
+ call void @use(i32 %iv.add)
+ %iv.add2 = xor i32 %iv, -1
+ br label %loop
+}
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