search for: vgpr0

.... The fundamental problem is complexity from the fact that undef values are a special case since they don't have an associated VNInfo/Segment unless the value is used across blocks. For example, in this case, %0 has 2 subregisters sub0 and sub1: bb.0: undef %0.sub1:vreg_64 = COPY killed $vgpr0 bb.1: %0:vreg_64 = COPY %0 S_CBRANCH_EXECNZ %bb.1, implicit $exec bb.2: undef %0.sub1:vreg_64 = nofpexcept V_CEIL_F32_e32 killed %0.sub1, implicit $mode, implicit $exec S_BRANCH %bb.1 sub0 has no defined values anywhere in this function. The value only exists due to this iden...

...bugging in Mesa clients. Here's an example of the output in a Mesa client with a corresponding patch and RADEON_DUMP_SHADERS set: Shader Disassembly: S_WQM_B64 EXEC, EXEC ; BEFE0A7E S_MOV_B32 M0, SGPR6 ; BEFC0306 V_INTERP_MOV_F32 VGPR0, P0, 3, 0, [M0] ; C8020302 V_INTERP_MOV_F32 VGPR1, P0, 2, 0, [M0] ; C8060202 V_INTERP_MOV_F32 VGPR2, P0, 1, 0, [M0] ; C80A0102 V_INTERP_MOV_F32 VGPR3, P0, 0, 0, [M0] ; C80E0002 EXP 15, 0, 0, 1, 1, VGPR3, VGPR2, VGPR1, VGPR0 ; F800180F 00010203 S_ENDPGM...

...d VGPRs for vALU. The vALU can read from VGPRs and also SGPRs, but the sALU can only read from SGPRs. This restriction on the sALU seems to be causing the instruction selector to generate some illegal copies, which is the main problem I'm trying to solve. For example: NODE0 = ISD::ADD SGPR0, VGPR0 can be selected to: SGPR2 = COPY VGPR0 SGPR1 = S_ADD SGPR0, SGPR2 This leaves us with a copy from a VGPR to an SGPR, which is illegal. Any suggestions on how to solve this problem or how best to model these two ALUs? Thanks, Tom

...s an example of the output in a Mesa client with a corresponding > patch and RADEON_DUMP_SHADERS set: > > Shader Disassembly: > > S_WQM_B64 EXEC, EXEC ; BEFE0A7E > S_MOV_B32 M0, SGPR6 ; BEFC0306 > V_INTERP_MOV_F32 VGPR0, P0, 3, 0, [M0] ; C8020302 > V_INTERP_MOV_F32 VGPR1, P0, 2, 0, [M0] ; C8060202 > V_INTERP_MOV_F32 VGPR2, P0, 1, 0, [M0] ; C80A0102 > V_INTERP_MOV_F32 VGPR3, P0, 0, 0, [M0] ; C80E0002 > EXP 15, 0, 0, 1, 1, VGPR3, VGPR2, VGPR1, VGPR0 ; F800180F...