From: Zack Rusin Date: Tue, 9 Feb 2010 02:50:33 +0000 (-0500) Subject: llvmpipe: switch to using dynamic stack allocation instead of registers X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=85c7ec70ad41c8ada75a4cbace83d16815d3e2c5;p=mesa.git llvmpipe: switch to using dynamic stack allocation instead of registers with mutable vars we don't need to follow the phi nodes. meaning that control flow becomes trivial as we don't have scan the rest of the tgsi to figure out the variable usage anymore. futhermore the memory2register pass promotes alloca/store/load to registers while inserting the right phi nodes. so we get simplicity and performance. --- diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.c b/src/gallium/auxiliary/gallivm/lp_bld_logic.c index d23de4f0ef8..41ac81b7441 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_logic.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.c @@ -419,3 +419,15 @@ lp_build_select_aos(struct lp_build_context *bld, #endif } } + +LLVMValueRef +lp_build_alloca(struct lp_build_context *bld) +{ + const struct lp_type type = bld->type; + + if (type.length > 1) { /*vector*/ + return LLVMBuildAlloca(bld->builder, lp_build_vec_type(type), ""); + } else { /*scalar*/ + return LLVMBuildAlloca(bld->builder, lp_build_elem_type(type), ""); + } +} diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.h b/src/gallium/auxiliary/gallivm/lp_bld_logic.h index 40d64eb2c19..a399ebf39ef 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_logic.h +++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.h @@ -76,5 +76,7 @@ lp_build_select_aos(struct lp_build_context *bld, LLVMValueRef b, const boolean cond[4]); +LLVMValueRef +lp_build_alloca(struct lp_build_context *bld); #endif /* !LP_BLD_LOGIC_H */ diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c index 85e3b1bdd42..a52c6c50288 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c @@ -185,7 +185,7 @@ emit_fetch( break; case TGSI_FILE_TEMPORARY: - res = bld->temps[reg->Register.Index][swizzle]; + res = LLVMBuildLoad(bld->base.builder, bld->temps[reg->Register.Index][swizzle], ""); if(!res) return bld->base.undef; break; @@ -287,11 +287,13 @@ emit_store( switch( reg->Register.File ) { case TGSI_FILE_OUTPUT: - bld->outputs[reg->Register.Index][chan_index] = value; + LLVMBuildStore(bld->base.builder, value, + bld->outputs[reg->Register.Index][chan_index]); break; case TGSI_FILE_TEMPORARY: - bld->temps[reg->Register.Index][chan_index] = value; + LLVMBuildStore(bld->base.builder, value, + bld->temps[reg->Register.Index][chan_index]); break; case TGSI_FILE_ADDRESS: @@ -438,6 +440,42 @@ indirect_temp_reference(const struct tgsi_full_instruction *inst) return FALSE; } +static int +emit_declaration( + struct lp_build_tgsi_soa_context *bld, + const struct tgsi_full_declaration *decl) +{ + unsigned first = decl->Range.First; + unsigned last = decl->Range.Last; + unsigned idx, i; + + for (idx = first; idx <= last; ++idx) { + boolean ok; + + switch (decl->Declaration.File) { + case TGSI_FILE_TEMPORARY: + for (i = 0; i < NUM_CHANNELS; i++) + bld->temps[idx][i] = lp_build_alloca(&bld->base); + ok = TRUE; + break; + + case TGSI_FILE_OUTPUT: + for (i = 0; i < NUM_CHANNELS; i++) + bld->outputs[idx][i] = lp_build_alloca(&bld->base); + ok = TRUE; + break; + + default: + /* don't need to declare other vars */ + ok = TRUE; + } + + if (!ok) + return FALSE; + } + + return TRUE; +} static int emit_instruction( @@ -1429,6 +1467,10 @@ lp_build_tgsi_soa(LLVMBuilderRef builder, switch( parse.FullToken.Token.Type ) { case TGSI_TOKEN_TYPE_DECLARATION: /* Inputs already interpolated */ + { + if (!emit_declaration( &bld, &parse.FullToken.FullDeclaration )) + _debug_printf("warning: failed to define LLVM variable\n"); + } break; case TGSI_TOKEN_TYPE_INSTRUCTION: diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c index 320e2b72e43..2001a95661e 100644 --- a/src/gallium/drivers/llvmpipe/lp_state_fs.c +++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c @@ -468,20 +468,21 @@ generate_fs(struct llvmpipe_context *lp, for (attrib = 0; attrib < shader->info.num_outputs; ++attrib) { for(chan = 0; chan < NUM_CHANNELS; ++chan) { if(outputs[attrib][chan]) { - lp_build_name(outputs[attrib][chan], "output%u.%u.%c", i, attrib, "xyzw"[chan]); + LLVMValueRef out = LLVMBuildLoad(builder, outputs[attrib][chan], ""); + lp_build_name(out, "output%u.%u.%c", i, attrib, "xyzw"[chan]); switch (shader->info.output_semantic_name[attrib]) { case TGSI_SEMANTIC_COLOR: { unsigned cbuf = shader->info.output_semantic_index[attrib]; - lp_build_name(outputs[attrib][chan], "color%u.%u.%c", i, attrib, "rgba"[chan]); + lp_build_name(out, "color%u.%u.%c", i, attrib, "rgba"[chan]); /* Alpha test */ /* XXX: should the alpha reference value be passed separately? */ /* XXX: should only test the final assignment to alpha */ if(cbuf == 0 && chan == 3) { - LLVMValueRef alpha = outputs[attrib][chan]; + LLVMValueRef alpha = out; LLVMValueRef alpha_ref_value; alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr); alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value); @@ -489,13 +490,13 @@ generate_fs(struct llvmpipe_context *lp, &mask, alpha, alpha_ref_value); } - color[cbuf][chan] = outputs[attrib][chan]; + color[cbuf][chan] = out; break; } case TGSI_SEMANTIC_POSITION: if(chan == 2) - z = outputs[attrib][chan]; + z = out; break; } }