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ac: Use DPP for build_ddxy where possible. 

WQM is pretty reliable now on LLVM 7, so let us just use
DPP + WQM.

This gives approximately a 1.5% performance increase on the
vrcompositor built-in benchmark.

v2: Use ac_build_quad_swizzle.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Bas Nieuwenhuizen 2018-05-23 11:34:15 +02:00
parent b73b340c37
commit 699e1f5aac
1 changed files with 15 additions and 1 deletions
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16
src/amd/common/ac_llvm_build.c
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@ -1170,7 +1170,21 @@ ac_build_ddxy(struct ac_llvm_context *ctx,
LLVMValueRef tl, trbl, args[2];
LLVMValueRef result;
if (ctx->chip_class >= VI) {
if (HAVE_LLVM >= 0x0700) {
unsigned tl_lanes[4], trbl_lanes[4];
for (unsigned i = 0; i < 4; ++i) {
tl_lanes[i] = i & mask;
trbl_lanes[i] = (i & mask) + idx;
}
tl = ac_build_quad_swizzle(ctx, val,
tl_lanes[0], tl_lanes[1],
tl_lanes[2], tl_lanes[3]);
trbl = ac_build_quad_swizzle(ctx, val,
trbl_lanes[0], trbl_lanes[1],
trbl_lanes[2], trbl_lanes[3]);
} else if (ctx->chip_class >= VI) {
LLVMValueRef thread_id, tl_tid, trbl_tid;
thread_id = ac_get_thread_id(ctx);