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ac: add ac_build_readlane without optimization barrier 

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
This commit is contained in:
Marek Olšák 2020-01-02 18:41:26 -05:00
parent 77393cf39b
commit 0f45d4dc2b
2 changed files with 17 additions and 4 deletions
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18
src/amd/llvm/ac_llvm_build.c
View File

@ -3595,8 +3595,6 @@ _ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef l
LLVMTypeRef type = LLVMTypeOf(src);
LLVMValueRef result;
ac_build_optimization_barrier(ctx, &src);
src = LLVMBuildZExt(ctx->builder, src, ctx->i32, "");
if (lane)
lane = LLVMBuildZExt(ctx->builder, lane, ctx->i32, "");
@ -3613,13 +3611,17 @@ _ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef l
/**
* Builds the "llvm.amdgcn.readlane" or "llvm.amdgcn.readfirstlane" intrinsic.
*
* The optimization barrier is not needed if the value is the same in all lanes
* or if this is called in the outermost block.
*
* @param ctx
* @param src
* @param lane - id of the lane or NULL for the first active lane
* @return value of the lane
*/
LLVMValueRef
ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
LLVMValueRef ac_build_readlane_no_opt_barrier(struct ac_llvm_context *ctx,
LLVMValueRef src, LLVMValueRef lane)
{
LLVMTypeRef src_type = LLVMTypeOf(src);
src = ac_to_integer(ctx, src);
@ -3648,6 +3650,14 @@ ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef la
return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
}
LLVMValueRef
ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
{
ac_build_optimization_barrier(ctx, &src);
return ac_build_readlane_no_opt_barrier(ctx, src, lane);
}
LLVMValueRef
ac_build_writelane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef value, LLVMValueRef lane)
{

3
src/amd/llvm/ac_llvm_build.h
View File

@ -655,6 +655,9 @@ void ac_apply_fmask_to_sample(struct ac_llvm_context *ac, LLVMValueRef fmask,
LLVMValueRef
ac_build_ds_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned mask);
LLVMValueRef ac_build_readlane_no_opt_barrier(struct ac_llvm_context *ctx,
LLVMValueRef src, LLVMValueRef lane);
LLVMValueRef
ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane);