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ac: use llvm.amdgcn.writelane

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Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
This commit is contained in:
Marek Olšák 2019-07-16 01:07:49 -04:00
parent 39d0c68321
commit 47dee97329
1 changed files with 6 additions and 2 deletions
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8
src/amd/common/ac_llvm_build.c
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@ -3825,8 +3825,12 @@ ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef la
LLVMValueRef
ac_build_writelane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef value, LLVMValueRef lane)
{
/* TODO: Use the actual instruction when LLVM adds an intrinsic for it.
*/
if (HAVE_LLVM >= 0x0800) {
return ac_build_intrinsic(ctx, "llvm.amdgcn.writelane", ctx->i32,
(LLVMValueRef []) {value, lane, src}, 3,
AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
}
LLVMValueRef pred = LLVMBuildICmp(ctx->builder, LLVMIntEQ, lane,
ac_get_thread_id(ctx), "");
return LLVMBuildSelect(ctx->builder, pred, value, src, "");