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[SimplifyCFG] Add test for PR48778 (NFC) 

The sdiv is incorrectly speculated.
This commit is contained in:
Nikita Popov 2021-01-17 19:57:59 +01:00
parent 9a7fb08487
commit 1cc477f030
1 changed files with 26 additions and 0 deletions
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26
llvm/test/Transforms/SimplifyCFG/pr48778-sdiv-speculation.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -simplifycfg -S < %s | FileCheck %s
; sdiv INT_MIN / -1 should not be speculated.
define i32 @test(i1 %cmp) {
; CHECK-LABEL: @test(
; CHECK-NEXT: else:
; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 -2147483648, -1
; CHECK-NEXT: [[CMP2:%.*]] = icmp ne i32 [[DIV]], 0
; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[CMP:%.*]], [[CMP2]]
; CHECK-NEXT: [[MERGE:%.*]] = select i1 [[OR_COND]], i32 1, i32 0
; CHECK-NEXT: ret i32 [[MERGE]]
;
br i1 %cmp, label %if, label %else
if:
%div = sdiv i32 -2147483648, -1
%cmp2 = icmp ne i32 %div, 0
br i1 %cmp2, label %end, label %else
else:
ret i32 0
end:
ret i32 1
}