Mesa (main): ac/llvm: Implement usub_sat and isub_sat.

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Module: Mesa
Branch: main
Commit: 8671b866bf4b7909227f8d28307937eedfb347b9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8671b866bf4b7909227f8d28307937eedfb347b9

Author: Georg Lehmann <dadschoorse at gmail.com>
Date:   Sat Nov 20 20:45:57 2021 +0100

ac/llvm: Implement usub_sat and isub_sat.

Signed-off-by: Georg Lehmann <dadschoorse at gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13895>

---

 src/amd/llvm/ac_nir_to_llvm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/amd/llvm/ac_nir_to_llvm.c b/src/amd/llvm/ac_nir_to_llvm.c
index 3b740cf9431..50dd2e0665f 100644
--- a/src/amd/llvm/ac_nir_to_llvm.c
+++ b/src/amd/llvm/ac_nir_to_llvm.c
@@ -649,6 +649,15 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
       result = ac_build_intrinsic(&ctx->ac, name, def_type, src, 2, AC_FUNC_ATTR_READNONE);
       break;
    }
+   case nir_op_usub_sat:
+   case nir_op_isub_sat: {
+      char name[64], type[64];
+      ac_build_type_name_for_intr(def_type, type, sizeof(type));
+      snprintf(name, sizeof(name), "llvm.%csub.sat.%s",
+               instr->op == nir_op_usub_sat ? 'u' : 's', type);
+      result = ac_build_intrinsic(&ctx->ac, name, def_type, src, 2, AC_FUNC_ATTR_READNONE);
+      break;
+   }
    case nir_op_fadd:
       src[0] = ac_to_float(&ctx->ac, src[0]);
       src[1] = ac_to_float(&ctx->ac, src[1]);