search for: expandintres_shift

...de you pasted came from the function ExpandShiftByConstant and indeed it looks correct. In my example I used 6 as the shift amount but forgot to mention that it's stored in a register. Otherwise ExpandShiftWithUnknownAmountBit wouldn't get called. Below is the execution of DAGTypeLegalizer::ExpandIntRes_Shift() using my example showing how ExpandShiftWithUnknownAmountBit gets called. My email is about the logic of this function. if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1))) { <== False ... } if (ExpandShiftWithKnownAmountBit(N, Lo, Hi)) { <== The call returns Fa...

Hi Javier, > The problem is the implementation of the expansion. Perhaps an example > can help illustrate better. Take the case of a 64-bit integer shifted > left by say 6 bits and is decomposed using 32-bit registers. Because 6 > is less than the 32 (the register size) the resulting low part should be > equal to the source low part shifted left by 6 bits. The current >

Hi All, I am looking at a linker error under O2: undefined symbol __lshrdi3 I have two questions here: 1. Does that mean our libgcc (?) doesn't implement __lshrdi3? Or more generally, why I have such linker error? 2. Seems some operations are combined, and replaced with __lshrdi3 call. I am interested in when such libcall will be generated? Could you show me one

Hi Duncan, The problem is the implementation of the expansion. Perhaps an example can help illustrate better. Take the case of a 64-bit integer shifted left by say 6 bits and is decomposed using 32-bit registers. Because 6 is less than the 32 (the register size) the resulting low part should be equal to the source low part shifted left by 6 bits. The current implementation places a zero