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[InstCombine] Add test for iterator invalidation bug; NFC

This commit is contained in:
Nikita Popov 2020-01-13 23:49:03 +01:00
parent 2a43688a0a
commit fa63234093
1 changed files with 36 additions and 0 deletions
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36
llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -instcombine < %s | FileCheck %s
@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 }
}