diff options
author | Dave Airlie <airlied@redhat.com> | 2009-03-20 10:52:17 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2009-03-20 10:52:17 +1000 |
commit | 407e8ae5b167b0193e1e5b1266a5d61ed836dfb5 (patch) | |
tree | 2d9d05a5c3122f41a13aa8bd9ae921c1176e6b0d /src/mesa/drivers/dri/i965/brw_eu.c | |
parent | bdaa0341caffc353fd26bbd91865c2d86eed11c1 (diff) | |
parent | 114bb54324f22cb53bcd14607234d0acd74d37bd (diff) |
Merge remote branch 'main/master' into radeon-rewrite
Conflicts:
src/mesa/drivers/dri/r300/r300_cmdbuf.c
src/mesa/drivers/dri/r300/r300_state.c
src/mesa/drivers/dri/r300/r300_swtcl.c
src/mesa/drivers/dri/r300/radeon_ioctl.c
src/mesa/drivers/dri/radeon/radeon_screen.c
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_eu.c')
-rw-r--r-- | src/mesa/drivers/dri/i965/brw_eu.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_eu.c b/src/mesa/drivers/dri/i965/brw_eu.c index b3ae4eef33..c53efba599 100644 --- a/src/mesa/drivers/dri/i965/brw_eu.c +++ b/src/mesa/drivers/dri/i965/brw_eu.c @@ -129,3 +129,126 @@ const GLuint *brw_get_program( struct brw_compile *p, return (const GLuint *)p->store; } + + +/** + * Subroutine calls require special attention. + * Mesa instructions may be expanded into multiple hardware instructions + * so the prog_instruction::BranchTarget field can't be used as an index + * into the hardware instructions. + * + * The BranchTarget field isn't needed, however. Mesa's GLSL compiler + * emits CAL and BGNSUB instructions with labels that can be used to map + * subroutine calls to actual subroutine code blocks. + * + * The structures and function here implement patching of CAL instructions + * so they jump to the right subroutine code... + */ + + +/** + * For each OPCODE_BGNSUB we create one of these. + */ +struct brw_glsl_label +{ + const char *name; /**< the label string */ + GLuint position; /**< the position of the brw instruction for this label */ + struct brw_glsl_label *next; /**< next in linked list */ +}; + + +/** + * For each OPCODE_CAL we create one of these. + */ +struct brw_glsl_call +{ + GLuint call_inst_pos; /**< location of the CAL instruction */ + const char *sub_name; /**< name of subroutine to call */ + struct brw_glsl_call *next; /**< next in linked list */ +}; + + +/** + * Called for each OPCODE_BGNSUB. + */ +void +brw_save_label(struct brw_compile *c, const char *name, GLuint position) +{ + struct brw_glsl_label *label = CALLOC_STRUCT(brw_glsl_label); + label->name = name; + label->position = position; + label->next = c->first_label; + c->first_label = label; +} + + +/** + * Called for each OPCODE_CAL. + */ +void +brw_save_call(struct brw_compile *c, const char *name, GLuint call_pos) +{ + struct brw_glsl_call *call = CALLOC_STRUCT(brw_glsl_call); + call->call_inst_pos = call_pos; + call->sub_name = name; + call->next = c->first_call; + c->first_call = call; +} + + +/** + * Lookup a label, return label's position/offset. + */ +static GLuint +brw_lookup_label(struct brw_compile *c, const char *name) +{ + const struct brw_glsl_label *label; + for (label = c->first_label; label; label = label->next) { + if (strcmp(name, label->name) == 0) { + return label->position; + } + } + abort(); /* should never happen */ + return ~0; +} + + +/** + * When we're done generating code, this function is called to resolve + * subroutine calls. + */ +void +brw_resolve_cals(struct brw_compile *c) +{ + const struct brw_glsl_call *call; + + for (call = c->first_call; call; call = call->next) { + const GLuint sub_loc = brw_lookup_label(c, call->sub_name); + struct brw_instruction *brw_call_inst = &c->store[call->call_inst_pos]; + struct brw_instruction *brw_sub_inst = &c->store[sub_loc]; + GLint offset = brw_sub_inst - brw_call_inst; + + /* patch brw_inst1 to point to brw_inst2 */ + brw_set_src1(brw_call_inst, brw_imm_d(offset * 16)); + } + + /* free linked list of calls */ + { + struct brw_glsl_call *call, *next; + for (call = c->first_call; call; call = next) { + next = call->next; + _mesa_free(call); + } + c->first_call = NULL; + } + + /* free linked list of labels */ + { + struct brw_glsl_label *label, *next; + for (label = c->first_label; label; label = next) { + next = label->next; + _mesa_free(label); + } + c->first_label = NULL; + } +} |