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| author | Sanjay Patel <spatel@rotateright.com> | 2018-04-02 20:23:54 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2018-04-02 20:23:54 +0000 |
| commit | be0442eeaaefbce1e3ed1f0f1af5b7044544b99f (patch) | |
| tree | 875b074aef2c68d0fda7e9cac1c7db8fb63238e6 /llvm/test/Transforms | |
| parent | 399d96e39c64f1fd3a00b78886a02abe58cdb36f (diff) | |
| download | bcm5719-llvm-be0442eeaaefbce1e3ed1f0f1af5b7044544b99f.tar.gz bcm5719-llvm-be0442eeaaefbce1e3ed1f0f1af5b7044544b99f.zip | |
[InstCombine] add tests for icmp (sub x, y), x (PR36969); NFC
llvm-svn: 329010
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/icmp.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/icmp.ll b/llvm/test/Transforms/InstCombine/icmp.ll index c67fd0aeb70..6e6a9135350 100644 --- a/llvm/test/Transforms/InstCombine/icmp.ll +++ b/llvm/test/Transforms/InstCombine/icmp.ll @@ -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( |
