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2e9661573f
CTTZ and CTPOP. The expansion code differs from that in LegalizeDAG in that it chooses to take the CTLZ/CTTZ count from the Hi/Lo part depending on whether the Hi/Lo value is zero, not on whether CTLZ/CTTZ of Hi/Lo returned 32 (or whatever the width of the type is) for it. I made this change because the optimizers may well know that Hi/Lo is zero and exploit it. The promotion code for CTTZ also differs from that in LegalizeDAG: it uses an "or" to get the right result when the original value is zero, rather than using a compare and select. This also means the value doesn't need to be zero extended. llvm-svn: 47075
22 lines
906 B
LLVM
22 lines
906 B
LLVM
; RUN: llvm-as < %s | llc
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@.str = internal constant [14 x i8] c"%lld %d %d %d\00"
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define i32 @main(i64 %arg) nounwind {
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entry:
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%tmp37 = tail call i64 @llvm.ctlz.i64( i64 %arg ) ; <i64> [#uses=1]
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%tmp47 = tail call i64 @llvm.cttz.i64( i64 %arg ) ; <i64> [#uses=1]
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%tmp57 = tail call i64 @llvm.ctpop.i64( i64 %arg ) ; <i64> [#uses=1]
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%tmp38 = trunc i64 %tmp37 to i32 ; <i32>:0 [#uses=1]
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%tmp48 = trunc i64 %tmp47 to i32 ; <i32>:0 [#uses=1]
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%tmp58 = trunc i64 %tmp57 to i32 ; <i32>:0 [#uses=1]
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%tmp40 = tail call i32 (i8*, ...)* @printf( i8* noalias getelementptr ([14 x i8]* @.str, i32 0, i32 0), i64 %arg, i32 %tmp38, i32 %tmp48, i32 %tmp58 ) nounwind ; <i32> [#uses=0]
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ret i32 0
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}
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declare i32 @printf(i8* noalias , ...) nounwind
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declare i64 @llvm.ctlz.i64(i64) nounwind readnone
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declare i64 @llvm.cttz.i64(i64) nounwind readnone
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declare i64 @llvm.ctpop.i64(i64) nounwind readnone
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