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[InstCombine] add tests for icmp (sub x, y), x (PR36969); NFC 

llvm-svn: 329010
This commit is contained in:
Sanjay Patel 2018-04-02 20:23:54 +00:00
parent 399d96e39c
commit be0442eeaa
1 changed files with 30 additions and 0 deletions
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30
llvm/test/Transforms/InstCombine/icmp.ll
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@ -545,6 +545,36 @@ define i1 @test36(i32 %x, i32 %y) {
ret i1 %c
}
; PR36969 - https://bugs.llvm.org/show_bug.cgi?id=36969
define i1 @ugt_sub(i32 %xsrc, i32 %y) {
; CHECK-LABEL: @ugt_sub(
; CHECK-NEXT: [[X:%.*]] = udiv i32 [[XSRC:%.*]], 42
; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[X]], [[Y:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i32 [[SUB]], [[X]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%x = udiv i32 %xsrc, 42 ; thwart complexity-based canonicalization
%sub = sub i32 %x, %y
%cmp = icmp ugt i32 %sub, %x
ret i1 %cmp
}
; Swap operands and predicate. Try a vector type to verify that works too.
define <2 x i1> @ult_sub(<2 x i8> %xsrc, <2 x i8> %y) {
; CHECK-LABEL: @ult_sub(
; CHECK-NEXT: [[X:%.*]] = udiv <2 x i8> [[XSRC:%.*]], <i8 42, i8 -42>
; CHECK-NEXT: [[SUB:%.*]] = sub <2 x i8> [[X]], [[Y:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp ult <2 x i8> [[X]], [[SUB]]
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%x = udiv <2 x i8> %xsrc, <i8 42, i8 -42> ; thwart complexity-based canonicalization
%sub = sub <2 x i8> %x, %y
%cmp = icmp ult <2 x i8> %x, %sub
ret <2 x i1> %cmp
}
; X - Y > X - Z -> Z > Y if there is no overflow.
define i1 @test37(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @test37(