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i965/fs: Detect multi-register MOVs correctly in register_coalesce.

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register_coalesce() was considering the exec_size of the MOV
instruction alone to decide whether the register at offset+1 of the
source VGRF was being copied to inst->dst.reg_offset+1 of the
destination VGRF, which is only a valid assumption if the move has a
32-bit execution type.  Use regs_read() instead to find out the number
of registers copied by the instruction.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Francisco Jerez 2015-07-28 11:25:59 +03:00
parent 2294ba9565
commit d0a42b457f
1 changed files with 1 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
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@ -195,7 +195,7 @@ fs_visitor::register_coalesce()
continue;
}
reg_to_offset[offset] = inst->dst.reg_offset;
if (inst->exec_size == 16)
if (inst->regs_written > 1)
reg_to_offset[offset + 1] = inst->dst.reg_offset + 1;
mov[offset] = inst;
channels_remaining -= inst->regs_written;