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gallivm: add pixel offsets in scatter stores

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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 */