From 717d8efd584d8db7fbbdbe7deb51371e28d6c492 Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Wed, 7 Sep 2016 14:36:32 -0700 Subject: [PATCH] i965/fs: Take into account misalignment in regs_written() and regs_read(). There was a workaround for this in fs_inst::size_read() for the SHADER_OPCODE_MOV_INDIRECT instruction and FIXED_GRF register file *only*. We should take this possibility into account for the sources and destinations of all instructions on all optimization passes that need to quantize dataflow in 32B increments by adding the amount of misalignment to the size read or written from the regs_read() and regs_written() helpers respectively. Reviewed-by: Iago Toral Quiroga --- src/mesa/drivers/dri/i965/brw_fs.cpp | 26 +------------------------- src/mesa/drivers/dri/i965/brw_ir_fs.h | 8 ++++---- 2 files changed, 5 insertions(+), 29 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 60907cd..375d73b 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -863,31 +863,7 @@ fs_inst::size_read(int arg) const case SHADER_OPCODE_MOV_INDIRECT: if (arg == 0) { assert(src[2].file == IMM); - unsigned region_length = src[2].ud; - - if (src[0].file == UNIFORM) { - assert(region_length % 4 == 0); - return region_length; - } else if (src[0].file == FIXED_GRF) { - /* If the start of the region is not register aligned, then - * there's some portion of the register that's technically - * unread at the beginning. - * - * However, the register allocator works in terms of whole - * registers, and does not use subnr. It assumes that the - * read starts at the beginning of the register, and extends - * regs_read() whole registers beyond that. - * - * To compensate, we extend the region length to include this - * unread portion at the beginning. - */ - if (src[0].subnr) - region_length += src[0].subnr; - - return region_length; - } else { - assert(!"Invalid register file"); - } + return src[2].ud; } break; diff --git a/src/mesa/drivers/dri/i965/brw_ir_fs.h b/src/mesa/drivers/dri/i965/brw_ir_fs.h index 0be67b7..c688345 100644 --- a/src/mesa/drivers/dri/i965/brw_ir_fs.h +++ b/src/mesa/drivers/dri/i965/brw_ir_fs.h @@ -435,9 +435,9 @@ set_saturate(bool saturate, fs_inst *inst) inline unsigned regs_written(const fs_inst *inst) { - /* XXX - Take into account register-misaligned offsets correctly. */ assert(inst->dst.file != UNIFORM && inst->dst.file != IMM); - return DIV_ROUND_UP(inst->size_written - + return DIV_ROUND_UP(reg_offset(inst->dst) % REG_SIZE + + inst->size_written - MIN2(inst->size_written, reg_padding(inst->dst)), REG_SIZE); } @@ -451,10 +451,10 @@ regs_written(const fs_inst *inst) inline unsigned regs_read(const fs_inst *inst, unsigned i) { - /* XXX - Take into account register-misaligned offsets correctly. */ const unsigned reg_size = inst->src[i].file == UNIFORM || inst->src[i].file == IMM ? 4 : REG_SIZE; - return DIV_ROUND_UP(inst->size_read(i) - + return DIV_ROUND_UP(reg_offset(inst->src[i]) % reg_size + + inst->size_read(i) - MIN2(inst->size_read(i), reg_padding(inst->src[i])), reg_size); } -- 2.7.4