diff options
Diffstat (limited to 'src/gallium/drivers/radeon')
| -rw-r--r-- | src/gallium/drivers/radeon/R600Instructions.td | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeon/R600Instructions.td b/src/gallium/drivers/radeon/R600Instructions.td index c96bc40eaf6..bb65c177f55 100644 --- a/src/gallium/drivers/radeon/R600Instructions.td +++ b/src/gallium/drivers/radeon/R600Instructions.td @@ -978,6 +978,15 @@ class VTX_READ_32_eg <bits<8> buffer_id, list<dag> pattern> let DST_SEL_Z = 7; // Masked let DST_SEL_W = 7; // Masked let DATA_FORMAT = 0xD; // COLOR_32 + + // This is not really necessary, but there were some GPU hangs that appeared + // to be caused by ALU instructions in the next instruction group that wrote + // to the $ptr registers of the VTX_READ. + // e.g. + // %T3_X<def> = VTX_READ_PARAM_i32_eg %T2_X<kill>, 24 + // %T2_X<def> = MOV %ZERO + //Adding this constraint prevents this from happening. + let Constraints = "$ptr.ptr = $dst"; } class VTX_READ_128_eg <bits<8> buffer_id, list<dag> pattern> @@ -989,6 +998,11 @@ class VTX_READ_128_eg <bits<8> buffer_id, list<dag> pattern> let DST_SEL_Z = 2; let DST_SEL_W = 3; let DATA_FORMAT = 0x22; // COLOR_32_32_32_32 + + // XXX: Need to force VTX_READ_128 instructions to write to the same register + // that holds its buffer address to avoid potential hangs. We can't use + // the same constraint as VTX_READ_32_eg, because the $ptr.ptr and $dst + // registers are different sizes. } //===----------------------------------------------------------------------===// |