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new test case for PR1280

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35401 91177308-0d34-0410-b5e6-96231b3b80d8
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Reid Spencer 2007-03-28 01:43:35 +00:00
parent 35c3885ba1
commit 12fa2224e4
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test/Transforms/InstCombine/2007-03-27-PR1280.ll Normal file
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; PR1280 - we should be able to reduce this function to a trunc/sext but it
; would involve using a bit width (24) that doesn't match a size that
; the back end can handle. This test makes sure that such a transform
; is not done. It should be removed when code gen supports "funny"
; bit widths.
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'add i49.*-8388608'
define i49 @test5(i49 %x) {
;; If we have ADD(XOR(AND(X, 0xFF), 0x80), 0xF..F80), it's a sext.
%X = and i49 %x, 16777215 ; 0x0000000ffffff
%tmp.2 = xor i49 %X, 8388608 ; 0x0000000800000
%tmp.4 = add i49 %tmp.2, -8388608 ; 0x1FFFFFF800000
ret i49 %tmp.4
}