ac/nir: use llvm.amdgcn.rsq for nir_op_frsq

[mesa.git] / src / amd / llvm / ac_nir_to_llvm.c

diff --git a/src/amd/llvm/ac_nir_to_llvm.c b/src/amd/llvm/ac_nir_to_llvm.c
index 1e7e95116935a3090f4c8ccf3670ec83e0b23d47..d1c333ac73d252004c6a54a003cf9ce3394f77e5 100644 (file)
--- a/src/amd/llvm/ac_nir_to_llvm.c
+++ b/src/amd/llvm/ac_nir_to_llvm.c
@@ -834,9 +834,8 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
                                              ac_to_float_type(&ctx->ac, def_type), src[0]);
                break;
        case nir_op_frsq:
                                              ac_to_float_type(&ctx->ac, def_type), src[0]);
                break;
        case nir_op_frsq:

-               result = emit_intrin_1f_param(&ctx->ac, "llvm.sqrt",
-                                             ac_to_float_type(&ctx->ac, def_type), src[0]);
-               result = ac_build_fdiv(&ctx->ac, LLVMConstReal(LLVMTypeOf(result), 1.0), result);
+               result = emit_intrin_1f_param(&ctx->ac, "llvm.amdgcn.rsq",
+                                             ac_to_float_type(&ctx->ac, def_type), src[0]);

                break;
        case nir_op_frexp_exp:
                src[0] = ac_to_float(&ctx->ac, src[0]);
                break;
        case nir_op_frexp_exp:
                src[0] = ac_to_float(&ctx->ac, src[0]);