From 160848d8ef96cf3a760c02cc576df7dbffc1f669 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Tue, 6 Sep 2011 12:26:42 -0700 Subject: [PATCH] i965/vs: Add a function for how many MRFs get written as part of a SEND. This will be used for compute-to-mrf, which needs to know when MRFs get overwritten. --- src/mesa/drivers/dri/i965/brw_vec4.cpp | 37 ++++++++++++++++++++++++++ src/mesa/drivers/dri/i965/brw_vec4.h | 2 ++ 2 files changed, 39 insertions(+) diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp index 1f2cebe157c..9079ca1d6ce 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp @@ -43,6 +43,43 @@ vec4_instruction::is_math() opcode == SHADER_OPCODE_COS || opcode == SHADER_OPCODE_POW); } +/** + * Returns how many MRFs an opcode will write over. + * + * Note that this is not the 0 or 1 implied writes in an actual gen + * instruction -- the generate_* functions generate additional MOVs + * for setup. + */ +int +vec4_visitor::implied_mrf_writes(vec4_instruction *inst) +{ + if (inst->mlen == 0) + return 0; + + switch (inst->opcode) { + case SHADER_OPCODE_RCP: + case SHADER_OPCODE_RSQ: + case SHADER_OPCODE_SQRT: + case SHADER_OPCODE_EXP2: + case SHADER_OPCODE_LOG2: + case SHADER_OPCODE_SIN: + case SHADER_OPCODE_COS: + return 1; + case SHADER_OPCODE_POW: + return 2; + case VS_OPCODE_URB_WRITE: + return 1; + case VS_OPCODE_PULL_CONSTANT_LOAD: + return 2; + case VS_OPCODE_SCRATCH_READ: + return 2; + case VS_OPCODE_SCRATCH_WRITE: + return 3; + default: + assert(!"not reached"); + return inst->mlen; + } +} bool src_reg::equals(src_reg *r) diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h index 317c981a40a..900c0a9037f 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4.h +++ b/src/mesa/drivers/dri/i965/brw_vec4.h @@ -441,6 +441,8 @@ public: vec4_instruction *SCRATCH_READ(dst_reg dst, src_reg index); vec4_instruction *SCRATCH_WRITE(dst_reg dst, src_reg src, src_reg index); + int implied_mrf_writes(vec4_instruction *inst); + bool try_rewrite_rhs_to_dst(ir_assignment *ir, dst_reg dst, src_reg src, -- 2.30.2