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radeonsi: add a helper for extracting bitfields from parameters (v2)

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This will be used a lot (especially by tessellation).

v2: don't use the bfe intrinsic

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
This commit is contained in:
Marek Olšák 2015-02-27 19:09:30 +01:00
parent 9735a62a2c
commit d3723c614f
1 changed files with 27 additions and 16 deletions
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43
src/gallium/drivers/radeonsi/si_shader.c
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@ -191,6 +191,30 @@ static int get_param_index(unsigned semantic_name, unsigned index,
return -1;
}
/**
* Get the value of a shader input parameter and extract a bitfield.
*/
static LLVMValueRef unpack_param(struct si_shader_context *si_shader_ctx,
unsigned param, unsigned rshift,
unsigned bitwidth)
{
struct gallivm_state *gallivm = &si_shader_ctx->radeon_bld.gallivm;
LLVMValueRef value = LLVMGetParam(si_shader_ctx->radeon_bld.main_fn,
param);
if (rshift)
value = LLVMBuildLShr(gallivm->builder, value,
lp_build_const_int32(gallivm, rshift), "");
if (rshift + bitwidth < 32) {
unsigned mask = (1 << bitwidth) - 1;
value = LLVMBuildAnd(gallivm->builder, value,
lp_build_const_int32(gallivm, mask), "");
}
return value;
}
/**
* Build an LLVM bytecode indexed load using LLVMBuildGEP + LLVMBuildLoad.
* It's equivalent to doing a load from &base_ptr[index].
@ -561,14 +585,8 @@ static void declare_input_fs(
static LLVMValueRef get_sample_id(struct radeon_llvm_context *radeon_bld)
{
struct gallivm_state *gallivm = &radeon_bld->gallivm;
LLVMValueRef value = LLVMGetParam(radeon_bld->main_fn,
SI_PARAM_ANCILLARY);
value = LLVMBuildLShr(gallivm->builder, value,
lp_build_const_int32(gallivm, 8), "");
value = LLVMBuildAnd(gallivm->builder, value,
lp_build_const_int32(gallivm, 0xf), "");
return value;
return unpack_param(si_shader_context(&radeon_bld->soa.bld_base),
SI_PARAM_ANCILLARY, 8, 4);
}
/**
@ -1013,16 +1031,9 @@ static void si_llvm_emit_streamout(struct si_shader_context *shader,
LLVMTypeRef i32 = LLVMInt32TypeInContext(gallivm->context);
LLVMValueRef so_param =
LLVMGetParam(shader->radeon_bld.main_fn,
shader->param_streamout_config);
/* Get bits [22:16], i.e. (so_param >> 16) & 127; */
LLVMValueRef so_vtx_count =
LLVMBuildAnd(builder,
LLVMBuildLShr(builder, so_param,
LLVMConstInt(i32, 16, 0), ""),
LLVMConstInt(i32, 127, 0), "");
unpack_param(shader, shader->param_streamout_config, 16, 7);
LLVMValueRef tid = build_intrinsic(builder, "llvm.SI.tid", i32,
NULL, 0, LLVMReadNoneAttribute);