Mesa (master): ac/llvm: remove the -1 hack from ac_atomic_inc_wrap

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Module: Mesa
Branch: master
Commit: 438392243fb284884e8499758064256fb3dad48d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=438392243fb284884e8499758064256fb3dad48d

Author: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Date:   Fri Jun 19 18:33:32 2020 +0200

ac/llvm: remove the -1 hack from ac_atomic_inc_wrap

To match the behavior of proprietary drivers.

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5688>

---

 src/amd/llvm/ac_nir_to_llvm.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/src/amd/llvm/ac_nir_to_llvm.c b/src/amd/llvm/ac_nir_to_llvm.c
index bd3cc246e5c..862ae5c30ff 100644
--- a/src/amd/llvm/ac_nir_to_llvm.c
+++ b/src/amd/llvm/ac_nir_to_llvm.c
@@ -3032,16 +3032,6 @@ static LLVMValueRef visit_image_atomic(struct ac_nir_context *ctx,
 	case nir_intrinsic_image_deref_atomic_inc_wrap: {
 		atomic_name = "inc";
 		atomic_subop = ac_atomic_inc_wrap;
-		/* ATOMIC_INC instruction does:
-		 *      value = (value + 1) % (data + 1)
-		 * but we want:
-		 *      value = (value + 1) % data
-		 * So replace 'data' by 'data - 1'.
-		 */
-		ctx->ssa_defs[instr->src[3].ssa->index] =
-			LLVMBuildSub(ctx->ac.builder,
-				     ctx->ssa_defs[instr->src[3].ssa->index],
-				     ctx->ac.i32_1, "");
 		break;
 	}
 	case nir_intrinsic_bindless_image_atomic_dec_wrap: