gallium/radeon: use lp_build_alloca_undef

Avoid building all those store 0 / store undef instruction pairs that
end up getting removed anyway.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
index 88c7b3c..8076443 100644 (file)
--- a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
+++ b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
@@ -502,15 +502,6 @@ static LLVMValueRef fetch_system_value(struct lp_build_tgsi_context *bld_base,
        return bitcast(bld_base, type, cval);
 }
 
-static LLVMValueRef si_build_alloca_undef(struct gallivm_state *gallivm,
-                                         LLVMTypeRef type,
-                                         const char *name)
-{
-       LLVMValueRef ptr = lp_build_alloca(gallivm, type, name);
-       LLVMBuildStore(gallivm->builder, LLVMGetUndef(type), ptr);
-       return ptr;
-}
-
 static void emit_declaration(struct lp_build_tgsi_context *bld_base,
                             const struct tgsi_full_declaration *decl)
 {
@@ -524,7 +515,7 @@ static void emit_declaration(struct lp_build_tgsi_context *bld_base,
                for (idx = decl->Range.First; idx <= decl->Range.Last; idx++) {
                        unsigned chan;
                        for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
-                                ctx->soa.addr[idx][chan] = si_build_alloca_undef(
+                                ctx->soa.addr[idx][chan] = lp_build_alloca_undef(
                                        &ctx->gallivm,
                                        ctx->soa.bld_base.uint_bld.elem_type, "");
                        }
@@ -588,7 +579,7 @@ static void emit_declaration(struct lp_build_tgsi_context *bld_base,
                                         first + i / 4, "xyzw"[i % 4]);
 #endif
                                ctx->temps[first * TGSI_NUM_CHANNELS + i] =
-                                       si_build_alloca_undef(bld_base->base.gallivm,
+                                       lp_build_alloca_undef(bld_base->base.gallivm,
                                                              bld_base->base.vec_type,
                                                              name);
                        }
@@ -606,7 +597,7 @@ static void emit_declaration(struct lp_build_tgsi_context *bld_base,
                                 * a shader ever reads from a channel that
                                 * it never writes to.
                                 */
-                               ctx->undef_alloca = si_build_alloca_undef(
+                               ctx->undef_alloca = lp_build_alloca_undef(
                                        bld_base->base.gallivm,
                                        bld_base->base.vec_type, "undef");
                        }
@@ -655,7 +646,7 @@ static void emit_declaration(struct lp_build_tgsi_context *bld_base,
                        unsigned chan;
                        assert(idx < RADEON_LLVM_MAX_OUTPUTS);
                        for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
-                               ctx->soa.outputs[idx][chan] = si_build_alloca_undef(
+                               ctx->soa.outputs[idx][chan] = lp_build_alloca_undef(
                                        &ctx->gallivm,
                                        ctx->soa.bld_base.base.elem_type, "");
                        }