search for: rsub_h

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2012 Mar 28
2
[LLVMdev] Remove subreg copies
Hi, I'm facing a problem in my BE while trying to remove certain copies. Here is a code snippet which I would like to optimize %vreg1<def> = 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 s...
2012 Mar 28
0
[LLVMdev] Remove subreg copies
...Ivan Llopard <ivanllopard at gmail.com> wrote: > Hi, > > I'm facing a problem in my BE while trying to remove certain copies. > Here is a code snippet which I would like to optimize > > %vreg1<def> = 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 cop...