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gallivm: implement scatter stores into temp register file 

Something is not quite right, however.  The piglit tests mentioned in
fd.o bug 31226 still don't pass.
This commit is contained in:
Brian Paul 2010-11-03 17:29:28 -06:00
parent c180e95d26
commit 2fefbc79ac
1 changed files with 47 additions and 4 deletions
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51
src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
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@ -467,9 +467,35 @@ build_gather(struct lp_build_tgsi_soa_context *bld,
}
/**
* Scatter/store vector.
*/
static void
build_scatter(struct lp_build_tgsi_soa_context *bld,
LLVMValueRef base_ptr,
LLVMValueRef indexes,
LLVMValueRef values)
{
LLVMBuilderRef builder = bld->base.builder;
unsigned i;
/*
* Loop over elements of index_vec, store scalar value.
*/
for (i = 0; i < bld->base.type.length; i++) {
LLVMValueRef ii = LLVMConstInt(LLVMInt32Type(), i, 0);
LLVMValueRef index = LLVMBuildExtractElement(builder, indexes, ii, "");
LLVMValueRef scalar_ptr = LLVMBuildGEP(builder, base_ptr, &index, 1, "scatter_ptr");
LLVMValueRef val = LLVMBuildExtractElement(builder, values, ii, "scatter_val");
LLVMBuildStore(builder, val, scalar_ptr);
}
}
/**
* Read the current value of the ADDR register, convert the floats to
* ints, multiply by four and return the vector of offsets.
* ints, add the base index and return the vector of offsets.
* The offsets will be used to index into the constant buffer or
* temporary register file.
*/
@ -748,6 +774,7 @@ emit_store(
LLVMValueRef value)
{
const struct tgsi_full_dst_register *reg = &inst->Dst[index];
struct lp_build_context *uint_bld = &bld->uint_bld;
LLVMValueRef indirect_index = NULL;
switch( inst->Instruction.Saturate ) {
@ -785,9 +812,25 @@ emit_store(
case TGSI_FILE_TEMPORARY:
if (reg->Register.Indirect) {
/* XXX not done yet */
debug_printf("WARNING: LLVM scatter store of temp regs"
" not implemented\n");
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;
LLVMTypeRef float_ptr_type;
/* index_vec = (indirect_index * 4 + chan_index) * length */
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);
float_ptr_type = LLVMPointerType(LLVMFloatType(), 0);
temps_array = LLVMBuildBitCast(bld->base.builder, bld->temps_array,
float_ptr_type, "");
/* Scatter store values into temp registers */
build_scatter(bld, temps_array, index_vec, value);
}
else {
LLVMValueRef temp_ptr = get_temp_ptr(bld, reg->Register.Index,