ac/llvm: add support for device clock on GFX11

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19267>

diff --git a/src/amd/llvm/ac_llvm_build.c b/src/amd/llvm/ac_llvm_build.c
index 8fecb47..88c798d 100644 (file)
--- a/src/amd/llvm/ac_llvm_build.c
+++ b/src/amd/llvm/ac_llvm_build.c
@@ -473,6 +473,13 @@ void ac_build_optimization_barrier(struct ac_llvm_context *ctx, LLVMValueRef *pg
 
 LLVMValueRef ac_build_shader_clock(struct ac_llvm_context *ctx, nir_scope scope)
 {
+   if (ctx->gfx_level >= GFX11 && scope == NIR_SCOPE_DEVICE) {
+      const char *name = "llvm.amdgcn.s.sendmsg.rtn.i64";
+      LLVMValueRef arg = LLVMConstInt(ctx->i32, 0x83 /* realtime */, 0);
+      LLVMValueRef tmp = ac_build_intrinsic(ctx, name, ctx->i64, &arg, 1, 0);
+      return LLVMBuildBitCast(ctx->builder, tmp, ctx->v2i32, "");
+   }
+
    const char *subgroup = "llvm.readcyclecounter";
    const char *name = scope == NIR_SCOPE_DEVICE ? "llvm.amdgcn.s.memrealtime" : subgroup;