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ac/llvm: Emit more efficient code for load_shared.

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Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9201>
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Timur Kristóf 2021-02-22 14:18:05 +01:00 • committed by Marge Bot
parent d5a79dbcf8
commit 14ad82b4e9
1 changed files with 7 additions and 9 deletions
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16
src/amd/llvm/ac_nir_to_llvm.c
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@ -2960,18 +2960,16 @@ static LLVMValueRef visit_first_invocation(struct ac_nir_context *ctx)
static LLVMValueRef visit_load_shared(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr)
{
LLVMValueRef values[4], derived_ptr, index, ret;
unsigned alignment = nir_intrinsic_align(instr);
unsigned const_off = nir_intrinsic_base(instr);
LLVMValueRef ptr = get_memory_ptr(ctx, instr->src[0], instr->dest.ssa.bit_size, const_off);
LLVMTypeRef result_type = get_def_type(ctx, &instr->dest.ssa);
int addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
LLVMValueRef derived_ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, LLVMPointerType(result_type, addr_space), "");
LLVMSetAlignment(derived_ptr, alignment);
for (int chan = 0; chan < instr->num_components; chan++) {
index = LLVMConstInt(ctx->ac.i32, chan, 0);
derived_ptr = LLVMBuildGEP(ctx->ac.builder, ptr, &index, 1, "");
values[chan] = LLVMBuildLoad(ctx->ac.builder, derived_ptr, "");
}
ret = ac_build_gather_values(&ctx->ac, values, instr->num_components);
LLVMValueRef ret = LLVMBuildLoad(ctx->ac.builder, derived_ptr, "");
return LLVMBuildBitCast(ctx->ac.builder, ret, get_def_type(ctx, &instr->dest.ssa), "");
}