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Test case for PR1271 involving construction of a bad mask to replace a

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shift instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-26 05:32:16 +00:00
parent 1be1284fe6
commit c3a53f2720
1 changed files with 28 additions and 0 deletions
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28
test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll Normal file
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; 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
}