https://bugs.llvm.org/show_bug.cgi?id=42399
Roman Lebedev <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |---
Status|RESOLVED |REOPENED
--- Comment #5 from Roman Lebedev <[email protected]> ---
... and it wasn't enough.
; Function Attrs: norecurse nounwind readnone
define i1 @test(i64 %storage, i32 %nbits) local_unnamed_addr #0 {
bb:
%skipnbits = sub nsw i32 64, %nbits
%skipnbitswide = zext i32 %skipnbits to i64
%datawide = lshr i64 %storage, %skipnbitswide
%data = trunc i64 %datawide to i32
%nbitsminusone = add nsw i32 %nbits, -1
%bitmask = shl i32 1, %nbitsminusone
%bitmasked = and i32 %bitmask, %data
%isbitunset = icmp eq i32 %bitmasked, 0
ret i1 %isbitunset
}
attributes #0 = { norecurse nounwind readnone }
Name: PR42399
%skipnbits = sub nsw i32 64, %nbits
%skipnbitswide = zext i32 %skipnbits to i64
%datawide = lshr i64 %storage, %skipnbitswide
%data = trunc i64 %datawide to i32
%nbitsminusone = add nsw i32 %nbits, -1
%bitmask = shl i32 1, %nbitsminusone
%bitmasked = and i32 %bitmask, %data
%isbitunset = icmp eq i32 %bitmasked, 0
=>
%isbitunset = icmp sgt i64 %storage, -1
https://rise4fun.com/Alive/hUu
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