diff options
Diffstat (limited to 'compiler/codeGen')
| -rw-r--r-- | compiler/codeGen/CgPrimOp.hs | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/compiler/codeGen/CgPrimOp.hs b/compiler/codeGen/CgPrimOp.hs index 0c8fb1a89a..88d60b654d 100644 --- a/compiler/codeGen/CgPrimOp.hs +++ b/compiler/codeGen/CgPrimOp.hs @@ -424,12 +424,21 @@ emitPrimOp [] CopyMutableByteArrayOp [src,src_off,dst,dst_off,n] live = emitPrimOp [] SetByteArrayOp [ba,off,len,c] live = doSetByteArrayOp ba off len c live --- Population count -emitPrimOp [res] PopCnt8Op [w] live = emitPopCntCall res w W8 live -emitPrimOp [res] PopCnt16Op [w] live = emitPopCntCall res w W16 live -emitPrimOp [res] PopCnt32Op [w] live = emitPopCntCall res w W32 live -emitPrimOp [res] PopCnt64Op [w] live = emitPopCntCall res w W64 live -emitPrimOp [res] PopCntOp [w] live = emitPopCntCall res w wordWidth live +-- Population count. +-- The type of the primop takes a Word#, so we have to be careful to narrow +-- to the correct width before calling the primop. Otherwise this can result +-- in a crash e.g. when calling the helper hs_popcnt8() which assumes that the +-- argument is <=0xff. +emitPrimOp [res] PopCnt8Op [w] live = + emitPopCntCall res (CmmMachOp mo_WordTo8 [w]) W8 live +emitPrimOp [res] PopCnt16Op [w] live = + emitPopCntCall res (CmmMachOp mo_WordTo16 [w]) W16 live +emitPrimOp [res] PopCnt32Op [w] live = + emitPopCntCall res (CmmMachOp mo_WordTo32 [w]) W32 live +emitPrimOp [res] PopCnt64Op [w] live = + emitPopCntCall res (CmmMachOp mo_WordTo64 [w]) W64 live +emitPrimOp [res] PopCntOp [w] live = + emitPopCntCall res w wordWidth live -- The rest just translate straightforwardly emitPrimOp [res] op [arg] _ |