[llvm-commits] CVS: llvm/test/Transforms/InstCombine/2007-03-27-PR1280.ll

[Reid Spencer]

Changes in directory llvm/test/Transforms/InstCombine:

2007-03-27-PR1280.ll added (r1.1)
---
Log message:

new test case for PR1280: http://llvm.org/PR1280 


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Diffs of the changes:  (+15 -0)

 2007-03-27-PR1280.ll |   15 +++++++++++++++
 1 files changed, 15 insertions(+)


Index: llvm/test/Transforms/InstCombine/2007-03-27-PR1280.ll
diff -c /dev/null llvm/test/Transforms/InstCombine/2007-03-27-PR1280.ll:1.1
*** /dev/null	Tue Mar 27 20:43:45 2007
--- llvm/test/Transforms/InstCombine/2007-03-27-PR1280.ll	Tue Mar 27 20:43:35 2007
***************
*** 0 ****
--- 1,15 ----
+ ; 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
+ }