Displaying 1 result from an estimated 1 matches for "systemzdagtodag".
2020 Feb 22
2
COPYs between register classes
...ied to find a simple way to constrain the register class of
such copies (also at -O0), but this turned out to not be quite simple.
Just selecting a pseudo instruction with a custom inserter does not seem
to work since CopyToReg/CopyFromReg have special handlings in InstrEmitter.
I then tried in SystemZDAGToDAG.cpp to select a CopyToReg to (CopyToReg
COPY_TO_REGCLASS), which worked fine. But I could not get the same
results with CopyFromReg. (COPY_TO_REGCLASS CopyFromReg) only resulted
in a later COPY into GR32, but the COPY from the Access register was
still first made to GRX32.
One alternative migh...