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move PR1941 here.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57586 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-10-15 16:33:52 +00:00
parent e90842ca52
commit 3b364cb986
1 changed files with 14 additions and 0 deletions

14
lib/Target/README.txt

@ -971,3 +971,17 @@ int main() {
//===---------------------------------------------------------------------===//
Instcombine will merge comparisons like (x >= 10) && (x < 20) by producing (x -
10) u< 10, but only when the comparisons have matching sign.
This could be converted with a similiar technique. (PR1941)
define i1 @test(i8 %x) {
%A = icmp uge i8 %x, 5
%B = icmp slt i8 %x, 20
%C = and i1 %A, %B
ret i1 %C
}
//===---------------------------------------------------------------------===//