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gallivm: add pixel offsets in scatter stores 

We want to do the scatter store to sequential locations in memory
for the vector of pixels we're processing in SOA format.
This commit is contained in:
Brian Paul 2010-11-04 09:31:56 -06:00
parent 5b294a5d17
commit ede232e989
1 changed files with 18 additions and 2 deletions
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20
src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
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@ -489,6 +489,10 @@ build_scatter(struct lp_build_tgsi_soa_context *bld,
LLVMValueRef scalar_ptr = LLVMBuildGEP(builder, base_ptr, &index, 1, "scatter_ptr");
LLVMValueRef val = LLVMBuildExtractElement(builder, values, ii, "scatter_val");
if (0)
lp_build_printf(builder, "scatter %d: val %f at %d %p\n",
ii, val, index, scalar_ptr);
LLVMBuildStore(builder, val, scalar_ptr);
}
}
@ -813,21 +817,33 @@ emit_store(
case TGSI_FILE_TEMPORARY:
if (reg->Register.Indirect) {
LLVMBuilderRef builder = bld->base.builder;
LLVMValueRef chan_vec =
lp_build_const_int_vec(uint_bld->type, chan_index);
LLVMValueRef length_vec =
lp_build_const_int_vec(uint_bld->type, bld->base.type.length);
LLVMValueRef index_vec; /* indexes into the temp registers */
LLVMValueRef temps_array;
LLVMValueRef pixel_offsets;
LLVMTypeRef float_ptr_type;
int i;
/* index_vec = (indirect_index * 4 + chan_index) * length */
/* build pixel offset vector: {0, 1, 2, 3, ...} */
pixel_offsets = uint_bld->undef;
for (i = 0; i < bld->base.type.length; i++) {
LLVMValueRef ii = lp_build_const_int32(i);
pixel_offsets = LLVMBuildInsertElement(builder, pixel_offsets,
ii, ii, "");
}
/* index_vec = (indirect_index * 4 + chan_index) * length + offsets */
index_vec = lp_build_shl_imm(uint_bld, indirect_index, 2);
index_vec = lp_build_add(uint_bld, index_vec, chan_vec);
index_vec = lp_build_mul(uint_bld, index_vec, length_vec);
index_vec = lp_build_add(uint_bld, index_vec, pixel_offsets);
float_ptr_type = LLVMPointerType(LLVMFloatType(), 0);
temps_array = LLVMBuildBitCast(bld->base.builder, bld->temps_array,
temps_array = LLVMBuildBitCast(builder, bld->temps_array,
float_ptr_type, "");
/* Scatter store values into temp registers */