[llvm-commits] CVS: llvm/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll

[Reid Spencer]

Changes in directory llvm/test/Transforms/InstCombine:

2007-03-25-BadShiftMask.ll added (r1.1)
---
Log message:

Test case for PR1271: http://llvm.org/PR1271  involving construction of a bad mask to replace a 
shift instruction.


---
Diffs of the changes:  (+28 -0)

 2007-03-25-BadShiftMask.ll |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+)


Index: llvm/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll
diff -c /dev/null llvm/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll:1.1
*** /dev/null	Mon Mar 26 00:32:26 2007
--- llvm/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll	Mon Mar 26 00:32:16 2007
***************
*** 0 ****
--- 1,28 ----
+ ; PR1271
+ ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'br i1 %1'
+ %struct..0anon = type { i32, i32 }
+ %struct..1anon = type { double }
+ 
+ define i32 @main() {
+ entry:
+ 	%u = alloca %struct..1anon, align 8		; <%struct..1anon*> [#uses=4]
+ 	%tmp1 = getelementptr %struct..1anon* %u, i32 0, i32 0		; <double*> [#uses=1]
+ 	store double 0x7FF0000000000000, double* %tmp1
+ 	%tmp3 = getelementptr %struct..1anon* %u, i32 0, i32 0		; <double*> [#uses=1]
+ 	%tmp34 = bitcast double* %tmp3 to %struct..0anon*		; <%struct..0anon*> [#uses=1]
+ 	%tmp5 = getelementptr %struct..0anon* %tmp34, i32 0, i32 1		; <i32*> [#uses=1]
+ 	%tmp6 = load i32* %tmp5		; <i32> [#uses=1]
+ 	%tmp7 = shl i32 %tmp6, 1		; <i32> [#uses=1]
+ 	%tmp8 = lshr i32 %tmp7, 21		; <i32> [#uses=1]
+ 	%tmp89 = trunc i32 %tmp8 to i16		; <i16> [#uses=1]
+ 	icmp ne i16 %tmp89, 2047		; <i1>:0 [#uses=1]
+ 	zext i1 %0 to i8		; <i8>:1 [#uses=1]
+ 	icmp ne i8 %1, 0		; <i1>:2 [#uses=1]
+ 	br i1 %2, label %cond_true, label %cond_false
+ 
+ cond_true:		; preds = %entry
+ 	ret i32 0
+ 
+ cond_false:		; preds = %entry
+         ret i32 1
+ }