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-rw-r--r--src/gallium/drivers/i965/brw_eu.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/src/gallium/drivers/i965/brw_eu.c b/src/gallium/drivers/i965/brw_eu.c
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index 0000000000..a8fcb5f97e
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+/*
+ Copyright (C) Intel Corp. 2006. All Rights Reserved.
+ Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
+ develop this 3D driver.
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice (including the
+ next paragraph) shall be included in all copies or substantial
+ portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+ **********************************************************************/
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "util/u_memory.h"
+
+#include "brw_context.h"
+#include "brw_defines.h"
+#include "brw_eu.h"
+
+
+
+/* How does predicate control work when execution_size != 8? Do I
+ * need to test/set for 0xffff when execution_size is 16?
+ */
+void brw_set_predicate_control_flag_value( struct brw_compile *p, GLuint value )
+{
+ p->current->header.predicate_control = BRW_PREDICATE_NONE;
+
+ if (value != 0xff) {
+ if (value != p->flag_value) {
+ brw_push_insn_state(p);
+ brw_MOV(p, brw_flag_reg(), brw_imm_uw(value));
+ p->flag_value = value;
+ brw_pop_insn_state(p);
+ }
+
+ p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
+ }
+}
+
+void brw_set_predicate_control( struct brw_compile *p, GLuint pc )
+{
+ p->current->header.predicate_control = pc;
+}
+
+void brw_set_conditionalmod( struct brw_compile *p, GLuint conditional )
+{
+ p->current->header.destreg__conditionalmod = conditional;
+}
+
+void brw_set_access_mode( struct brw_compile *p, GLuint access_mode )
+{
+ p->current->header.access_mode = access_mode;
+}
+
+void brw_set_compression_control( struct brw_compile *p, GLboolean compression_control )
+{
+ p->current->header.compression_control = compression_control;
+}
+
+void brw_set_mask_control( struct brw_compile *p, GLuint value )
+{
+ p->current->header.mask_control = value;
+}
+
+void brw_set_saturate( struct brw_compile *p, GLuint value )
+{
+ p->current->header.saturate = value;
+}
+
+void brw_push_insn_state( struct brw_compile *p )
+{
+ assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
+ memcpy(p->current+1, p->current, sizeof(struct brw_instruction));
+ p->current++;
+}
+
+void brw_pop_insn_state( struct brw_compile *p )
+{
+ assert(p->current != p->stack);
+ p->current--;
+}
+
+
+/***********************************************************************
+ */
+void brw_init_compile( struct brw_context *brw, struct brw_compile *p )
+{
+ p->brw = brw;
+ p->nr_insn = 0;
+ p->current = p->stack;
+ memset(p->current, 0, sizeof(p->current[0]));
+
+ /* Some defaults?
+ */
+ brw_set_mask_control(p, BRW_MASK_ENABLE); /* what does this do? */
+ brw_set_saturate(p, 0);
+ brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+ brw_set_predicate_control_flag_value(p, 0xff);
+}
+
+
+enum pipe_error brw_get_program( struct brw_compile *p,
+ const GLuint **data,
+ GLuint *sz )
+{
+ GLuint i;
+
+ for (i = 0; i < 8; i++)
+ brw_NOP(p);
+
+ /* Is the generated program malformed for some reason?
+ */
+ if (p->error)
+ return PIPE_ERROR_BAD_INPUT;
+
+ *sz = p->nr_insn * sizeof(struct brw_instruction);
+ *data = (const GLuint *)p->store;
+ return PIPE_OK;
+}
+
+
+
+/**
+ * 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_eu_label
+{
+ GLuint label; /**< the label number */
+ GLuint position; /**< the position of the brw instruction for this label */
+ struct brw_eu_label *next; /**< next in linked list */
+};
+
+
+/**
+ * For each OPCODE_CAL we create one of these.
+ */
+struct brw_eu_call
+{
+ GLuint call_inst_pos; /**< location of the CAL instruction */
+ GLuint label;
+ struct brw_eu_call *next; /**< next in linked list */
+};
+
+
+/**
+ * Called for each OPCODE_BGNSUB.
+ */
+void
+brw_save_label(struct brw_compile *c, unsigned l, GLuint position)
+{
+ struct brw_eu_label *label = CALLOC_STRUCT(brw_eu_label);
+ label->label = l;
+ 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, GLuint label, GLuint call_pos)
+{
+ struct brw_eu_call *call = CALLOC_STRUCT(brw_eu_call);
+ call->call_inst_pos = call_pos;
+ call->label = label;
+ 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, unsigned l)
+{
+ const struct brw_eu_label *label;
+ for (label = c->first_label; label; label = label->next) {
+ if (l == label->label) {
+ 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_eu_call *call;
+
+ for (call = c->first_call; call; call = call->next) {
+ const GLuint sub_loc = brw_lookup_label(c, call->label);
+ 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_eu_call *call, *next;
+ for (call = c->first_call; call; call = next) {
+ next = call->next;
+ FREE(call);
+ }
+ c->first_call = NULL;
+ }
+
+ /* free linked list of labels */
+ {
+ struct brw_eu_label *label, *next;
+ for (label = c->first_label; label; label = next) {
+ next = label->next;
+ FREE(label);
+ }
+ c->first_label = NULL;
+ }
+}
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