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move PR1941 here.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57586 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -971,3 +971,17 @@ int main() {
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//===---------------------------------------------------------------------===//
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Instcombine will merge comparisons like (x >= 10) && (x < 20) by producing (x -
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10) u< 10, but only when the comparisons have matching sign.
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This could be converted with a similiar technique. (PR1941)
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define i1 @test(i8 %x) {
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%A = icmp uge i8 %x, 5
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%B = icmp slt i8 %x, 20
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%C = and i1 %A, %B
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ret i1 %C
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}
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//===---------------------------------------------------------------------===//
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