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gallivm: implement correct indirect addressing of temp registers

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As with indexing the const buffer, the ADDR reg may have totally
different values for each element.  Need to use a gather operation.
This commit is contained in:
Brian Paul 2010-07-21 09:10:49 -06:00
parent 695814a15b
commit 105ed7dfd4
1 changed files with 30 additions and 12 deletions
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42
src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
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@ -549,22 +549,40 @@ emit_fetch(
break;
case TGSI_FILE_TEMPORARY:
{
LLVMValueRef addr = NULL;
if (reg->Register.Indirect) {
LLVMValueRef vec_len =
lp_build_const_int_vec(bld->int_bld.type, bld->base.type.length);
LLVMValueRef index_vec; /* index into the const buffer */
LLVMValueRef temps_array;
LLVMTypeRef float4_ptr_type;
assert(bld->has_indirect_addressing);
/* index_vec = broadcast(reg->Register.Index * 4 + swizzle) */
index_vec = lp_build_const_int_vec(bld->int_bld.type,
reg->Register.Index * 4 + swizzle);
/* index_vec += addr_vec */
index_vec = lp_build_add(&bld->int_bld, index_vec, addr_vec);
/* index_vec *= vector_length */
index_vec = lp_build_mul(&bld->int_bld, index_vec, vec_len);
/* cast temps_array pointer to float* */
float4_ptr_type = LLVMPointerType(LLVMFloatType(), 0);
temps_array = LLVMBuildBitCast(bld->int_bld.builder, bld->temps_array,
float4_ptr_type, "");
/* Gather values from the temporary register array */
res = build_gather(bld, temps_array, index_vec);
}
else {
LLVMValueRef temp_ptr;
if (reg->Register.Indirect) {
LLVMValueRef zero = lp_build_const_int32(0);
addr = LLVMBuildExtractElement(bld->base.builder,
addr_vec, zero, "");
}
temp_ptr = get_temp_ptr(bld, reg->Register.Index,
swizzle,
reg->Register.Indirect,
addr);
FALSE, NULL);
res = LLVMBuildLoad(bld->base.builder, temp_ptr, "");
if(!res)
if (!res)
return bld->base.undef;
}
break;