[llvm] fa63234 - [InstCombine] Add test for iterator invalidation bug; NFC

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2020-01-14T20:38:10+01:00
New Revision: fa632340938cc02e03262e1318cb06b34c32f5fe

URL: https://github.com/llvm/llvm-project/commit/fa632340938cc02e03262e1318cb06b34c32f5fe
DIFF: https://github.com/llvm/llvm-project/commit/fa632340938cc02e03262e1318cb06b34c32f5fe.diff

LOG: [InstCombine] Add test for iterator invalidation bug; NFC

Added: 
    llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll

Modified: 
    

Removed: 
    


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diff  --git a/llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll b/llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll
new file mode 100644
index 000000000000..d1af21f6c4d5
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll
@@ -0,0 +1,36 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+ at Q = internal unnamed_addr global double 1.000000e+00, align 8
+
+define double @test(i1 %c, i64* %p) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[END:%.*]]
+; CHECK:       if:
+; CHECK-NEXT:    [[LOAD:%.*]] = load i64, i64* bitcast (double* @Q to i64*), align 8
+; CHECK-NEXT:    [[TMP0:%.*]] = bitcast i64 [[LOAD]] to double
+; CHECK-NEXT:    [[PHITMP:%.*]] = bitcast i64 [[LOAD]] to double
+; CHECK-NEXT:    br label [[END]]
+; CHECK:       end:
+; CHECK-NEXT:    [[TMP1:%.*]] = phi double [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[TMP0]], [[IF]] ]
+; CHECK-NEXT:    [[PHI:%.*]] = phi double [ 0.000000e+00, [[ENTRY]] ], [ [[PHITMP]], [[IF]] ]
+; CHECK-NEXT:    [[TMP2:%.*]] = bitcast i64* [[P:%.*]] to double*
+; CHECK-NEXT:    store double [[TMP1]], double* [[TMP2]], align 8
+; CHECK-NEXT:    ret double [[PHI]]
+;
+entry:
+  br i1 %c, label %if, label %end
+
+if:
+  %load = load i64, i64* bitcast (double* @Q to i64*), align 8
+  br label %end
+
+end:
+  %phi = phi i64 [ 0, %entry ], [ %load, %if ]
+  store i64 %phi, i64* %p, align 8
+  %cast = bitcast i64 %phi to double
+  ret double %cast
+
+  uselistorder i64 %phi, { 1, 0 }
+}