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Fix an off-by-one error in ctpop combining.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-01-17 18:00:28 +00:00
parent 2522ae5922
commit c9b6a3eb90
2 changed files with 12 additions and 3 deletions
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13
test/CodeGen/X86/ctpop-combine.ll
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@@ -18,8 +18,7 @@ define i32 @test1(i64 %x) nounwind readnone {
define i32 @test2(i64 %x) nounwind readnone {
%count = tail call i64 @llvm.ctpop.i64(i64 %x)
%cast = trunc i64 %count to i32
%cmp = icmp ult i32 %cast, 2
%cmp = icmp ult i64 %count, 2
%conv = zext i1 %cmp to i32
ret i32 %conv
; CHECK: test2:
@@ -29,3 +28,13 @@ define i32 @test2(i64 %x) nounwind readnone {
; CHECK: ret
}
define i32 @test3(i64 %x) nounwind readnone {
%count = tail call i64 @llvm.ctpop.i64(i64 %x)
%cast = trunc i64 %count to i6 ; Too small for 0-64
%cmp = icmp ult i6 %cast, 2
%conv = zext i1 %cmp to i32
ret i32 %conv
; CHECK: test3:
; CHECK: cmpb $2
; CHECK: ret
}