From 8baee3d25beb616f6d5ba575684e889d60e38740 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Fri, 6 Nov 2009 17:45:13 -0800 Subject: [PATCH] i965: Use Compr4 instruction compression mode on G4X and newer. No statistically significant performance difference at n=3 with either openarena or my GL demo, but cutting program size seems like a good thing to be doing for the hypothetical app that has a working set near icache size. --- src/mesa/drivers/dri/i965/brw_eu.h | 10 ++++---- src/mesa/drivers/dri/i965/brw_eu_emit.c | 3 ++- src/mesa/drivers/dri/i965/brw_wm_emit.c | 33 ++++++++++++++++--------- 3 files changed, 29 insertions(+), 17 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h index 30603bdd0e6..39eb88d7c2b 100644 --- a/src/mesa/drivers/dri/i965/brw_eu.h +++ b/src/mesa/drivers/dri/i965/brw_eu.h @@ -170,11 +170,11 @@ static INLINE struct brw_reg brw_reg( GLuint file, GLuint writemask ) { struct brw_reg reg; - if (type == BRW_GENERAL_REGISTER_FILE) + if (file == BRW_GENERAL_REGISTER_FILE) assert(nr < BRW_MAX_GRF); - else if (type == BRW_MESSAGE_REGISTER_FILE) - assert(nr < BRW_MAX_MRF); - else if (type == BRW_ARCHITECTURE_REGISTER_FILE) + else if (file == BRW_MESSAGE_REGISTER_FILE) + assert((nr & ~(1 << 7)) < BRW_MAX_MRF); + else if (file == BRW_ARCHITECTURE_REGISTER_FILE) assert(nr <= BRW_ARF_IP); reg.type = type; @@ -538,7 +538,7 @@ static INLINE struct brw_reg brw_mask_reg( GLuint subnr ) static INLINE struct brw_reg brw_message_reg( GLuint nr ) { - assert(nr < BRW_MAX_MRF); + assert((nr & ~(1 << 7)) < BRW_MAX_MRF); return brw_vec8_reg(BRW_MESSAGE_REGISTER_FILE, nr, 0); diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c index 241cdc33f86..7ceabba288a 100644 --- a/src/mesa/drivers/dri/i965/brw_eu_emit.c +++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c @@ -55,7 +55,8 @@ static void guess_execution_size( struct brw_instruction *insn, static void brw_set_dest( struct brw_instruction *insn, struct brw_reg dest ) { - if (dest.type != BRW_ARCHITECTURE_REGISTER_FILE) + if (dest.file != BRW_ARCHITECTURE_REGISTER_FILE && + dest.file != BRW_MESSAGE_REGISTER_FILE) assert(dest.nr < 128); insn->bits1.da1.dest_reg_file = dest.file; diff --git a/src/mesa/drivers/dri/i965/brw_wm_emit.c b/src/mesa/drivers/dri/i965/brw_wm_emit.c index 9cd1fedacb7..eb37ea18640 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_emit.c +++ b/src/mesa/drivers/dri/i965/brw_wm_emit.c @@ -1105,6 +1105,7 @@ void emit_fb_write(struct brw_wm_compile *c, GLuint eot) { struct brw_compile *p = &c->func; + struct brw_context *brw = p->brw; GLuint nr = 2; GLuint channel; @@ -1119,18 +1120,28 @@ void emit_fb_write(struct brw_wm_compile *c, brw_push_insn_state(p); for (channel = 0; channel < 4; channel++) { - /* mov (8) m2.0<1>:ud r28.0<8;8,1>:ud { Align1 } */ - /* mov (8) m6.0<1>:ud r29.0<8;8,1>:ud { Align1 SecHalf } */ - brw_set_compression_control(p, BRW_COMPRESSION_NONE); - brw_MOV(p, - brw_message_reg(nr + channel), - arg0[channel]); - - if (c->dispatch_width == 16) { - brw_set_compression_control(p, BRW_COMPRESSION_2NDHALF); + if (c->dispatch_width == 16 && (BRW_IS_G4X(brw) || BRW_IS_IGDNG(brw))) { + /* By setting the high bit of the MRF register number, we indicate + * that we want COMPR4 mode - instead of doing the usual destination + * + 1 for the second half we get destination + 4. + */ brw_MOV(p, - brw_message_reg(nr + channel + 4), - sechalf(arg0[channel])); + brw_message_reg(nr + channel + (1 << 7)), + arg0[channel]); + } else { + /* mov (8) m2.0<1>:ud r28.0<8;8,1>:ud { Align1 } */ + /* mov (8) m6.0<1>:ud r29.0<8;8,1>:ud { Align1 SecHalf } */ + brw_set_compression_control(p, BRW_COMPRESSION_NONE); + brw_MOV(p, + brw_message_reg(nr + channel), + arg0[channel]); + + if (c->dispatch_width == 16) { + brw_set_compression_control(p, BRW_COMPRESSION_2NDHALF); + brw_MOV(p, + brw_message_reg(nr + channel + 4), + sechalf(arg0[channel])); + } } } /* skip over the regs populated above: -- 2.30.2