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radeonsi: Set range metadata on calls to llvm.SI.tid

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The range metadata tells LLVM the range of expected values for this intrinsic,
so it can do some additional optimizations on the result.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Tom Stellard 2016-04-18 14:33:43 -04:00
parent b31422d970
commit d3427412a3
1 changed files with 26 additions and 3 deletions
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29
src/gallium/drivers/radeonsi/si_shader.c
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@ -1116,12 +1116,35 @@ static LLVMValueRef get_sample_id(struct radeon_llvm_context *radeon_bld)
SI_PARAM_ANCILLARY, 8, 4);
}
/**
* Set range metadata on an instruction. This can only be used on load and
* call instructions. If you know an instruction can only produce the values
* 0, 1, 2, you would do set_range_metadata(value, 0, 3);
* \p lo is the minimum value inclusive.
* \p hi is the maximum value exclusive.
*/
static void set_range_metadata(LLVMValueRef value, unsigned lo, unsigned hi)
{
const char *range_md_string = "range";
LLVMValueRef range_md, md_args[2];
LLVMTypeRef type = LLVMTypeOf(value);
LLVMContextRef context = LLVMGetTypeContext(type);
unsigned md_range_id = LLVMGetMDKindIDInContext(context,
range_md_string, strlen(range_md_string));
md_args[0] = LLVMConstInt(type, lo, false);
md_args[1] = LLVMConstInt(type, hi, false);
range_md = LLVMMDNodeInContext(context, md_args, 2);
LLVMSetMetadata(value, md_range_id, range_md);
}
static LLVMValueRef get_thread_id(struct si_shader_context *ctx)
{
struct gallivm_state *gallivm = &ctx->radeon_bld.gallivm;
return lp_build_intrinsic(gallivm->builder, "llvm.SI.tid", ctx->i32,
NULL, 0, LLVMReadNoneAttribute);
LLVMValueRef tid = lp_build_intrinsic(gallivm->builder, "llvm.SI.tid",
ctx->i32, NULL, 0, LLVMReadNoneAttribute);
set_range_metadata(tid, 0, 64);
return tid;
}
/**