Displaying 2 results from an estimated 2 matches for "rahint".
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ahint
2012 Mar 28
2
[LLVMdev] Remove subreg copies
...READF32r; vRRegs:%vreg1
%vreg2<def> = COPY %vreg1:rsub_h; iRSubRegs:%vreg2 vRRegs:%vreg1
%vreg3<def> = COPY %vreg1:rsub_l; iRSubRegs:%vreg3 vRRegs:%vreg1
This code produces subreg-to-subreg copies but I would like to have
direct uses of vreg1's subregisters instead.
I tried to add RAhints in order to form identity copies (vreg1 and
vreg2/3 should be allocated to the same sub/super register) and let the
RA removes them automatically but it didn't work on all the copies. Is
there another method to get rid of these copies whenever possible ?
Ivan
2012 Mar 28
0
[LLVMdev] Remove subreg copies
...vreg2<def> = COPY %vreg1:rsub_h; iRSubRegs:%vreg2 vRRegs:%vreg1
> %vreg3<def> = COPY %vreg1:rsub_l; iRSubRegs:%vreg3 vRRegs:%vreg1
>
> This code produces subreg-to-subreg copies but I would like to have
> direct uses of vreg1's subregisters instead.
> I tried to add RAhints in order to form identity copies (vreg1 and
> vreg2/3 should be allocated to the same sub/super register) and let the
> RA removes them automatically but it didn't work on all the copies. Is
> there another method to get rid of these copies whenever possible ?
I assume you are usi...