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[InstCombine] Add a test case for a missed opportunity to turn a select into logic ops. 

llvm-svn: 310434
This commit is contained in:
Craig Topper 2017-08-09 01:30:22 +00:00
parent 5289843597
commit 24a6951187
1 changed files with 14 additions and 0 deletions
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14
llvm/test/Transforms/InstCombine/select-with-bitwise-ops.ll
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@ -384,6 +384,20 @@ define i32 @test69(i32 %x, i32 %y) {
ret i32 %select
}
; TODO: we should be able to remove this select
define i8 @test70(i8 %x, i8 %y) {
; CHECK-LABEL: @test70(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], 0
; CHECK-NEXT: [[OR:%.*]] = or i8 [[Y:%.*]], 2
; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], i8 [[OR]], i8 [[Y]]
; CHECK-NEXT: ret i8 [[SELECT]]
;
%cmp = icmp slt i8 %x, 0
%or = or i8 %y, 2
%select = select i1 %cmp, i8 %or, i8 %y
ret i8 %select
}
define i32 @shift_no_xor_multiuse_or(i32 %x, i32 %y) {
; CHECK-LABEL: @shift_no_xor_multiuse_or(
; CHECK-NEXT: [[OR:%.*]] = or i32 [[Y:%.*]], 2