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.
---
src/amd/common/ac_llvm_build.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index 36c1d62637b..0c0228fe9c7 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -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 (ctx->chip_class >= VI && 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);
--
2.17.0
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