[clang] [clang][wasm] Replace the target integer add saturate intrinsics with the equivalent generic `__builtin_elementwise_add_sat` intrinsics (PR #109269)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-x86

@llvm/pr-subscribers-clang

Author: Simon Pilgrim (RKSimon)

<details>
<summary>Changes</summary>

Noticed while working on #<!-- -->109160

I've left out the sub_sat intrinsics for now - not sure about the history behind them using Intrinsic::wasm_sub_sat_* instead of Intrinsic::*sub_sat

---
Full diff: https://github.com/llvm/llvm-project/pull/109269.diff


4 Files Affected:

- (modified) clang/include/clang/Basic/BuiltinsWebAssembly.def (-5) 
- (modified) clang/lib/CodeGen/CGBuiltin.cpp (-12) 
- (modified) clang/lib/Headers/wasm_simd128.h (+4-4) 
- (modified) clang/test/CodeGen/builtins-wasm.c (-29) 


``````````diff
diff --git a/clang/include/clang/Basic/BuiltinsWebAssembly.def b/clang/include/clang/Basic/BuiltinsWebAssembly.def
index ad73f031922a0b..38eb892d4a93bb 100644
--- a/clang/include/clang/Basic/BuiltinsWebAssembly.def
+++ b/clang/include/clang/Basic/BuiltinsWebAssembly.def
@@ -68,11 +68,6 @@ TARGET_BUILTIN(__builtin_wasm_trunc_saturate_u_i64_f64, "LLid", "nc", "nontrappi
 // SIMD builtins
 TARGET_BUILTIN(__builtin_wasm_swizzle_i8x16, "V16ScV16ScV16Sc", "nc", "simd128")
 
-TARGET_BUILTIN(__builtin_wasm_add_sat_s_i8x16, "V16ScV16ScV16Sc", "nc", "simd128")
-TARGET_BUILTIN(__builtin_wasm_add_sat_u_i8x16, "V16UcV16UcV16Uc", "nc", "simd128")
-TARGET_BUILTIN(__builtin_wasm_add_sat_s_i16x8, "V8sV8sV8s", "nc", "simd128")
-TARGET_BUILTIN(__builtin_wasm_add_sat_u_i16x8, "V8UsV8UsV8Us", "nc", "simd128")
-
 TARGET_BUILTIN(__builtin_wasm_sub_sat_s_i8x16, "V16ScV16ScV16Sc", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_sub_sat_u_i8x16, "V16UcV16UcV16Uc", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_sub_sat_s_i16x8, "V8sV8sV8s", "nc", "simd128")
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 7e18aafcdd4b8a..871f60ba712c9c 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -21478,24 +21478,12 @@ Value *CodeGenFunction::EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
     Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_swizzle);
     return Builder.CreateCall(Callee, {Src, Indices});
   }
-  case WebAssembly::BI__builtin_wasm_add_sat_s_i8x16:
-  case WebAssembly::BI__builtin_wasm_add_sat_u_i8x16:
-  case WebAssembly::BI__builtin_wasm_add_sat_s_i16x8:
-  case WebAssembly::BI__builtin_wasm_add_sat_u_i16x8:
   case WebAssembly::BI__builtin_wasm_sub_sat_s_i8x16:
   case WebAssembly::BI__builtin_wasm_sub_sat_u_i8x16:
   case WebAssembly::BI__builtin_wasm_sub_sat_s_i16x8:
   case WebAssembly::BI__builtin_wasm_sub_sat_u_i16x8: {
     unsigned IntNo;
     switch (BuiltinID) {
-    case WebAssembly::BI__builtin_wasm_add_sat_s_i8x16:
-    case WebAssembly::BI__builtin_wasm_add_sat_s_i16x8:
-      IntNo = Intrinsic::sadd_sat;
-      break;
-    case WebAssembly::BI__builtin_wasm_add_sat_u_i8x16:
-    case WebAssembly::BI__builtin_wasm_add_sat_u_i16x8:
-      IntNo = Intrinsic::uadd_sat;
-      break;
     case WebAssembly::BI__builtin_wasm_sub_sat_s_i8x16:
     case WebAssembly::BI__builtin_wasm_sub_sat_s_i16x8:
       IntNo = Intrinsic::wasm_sub_sat_signed;
diff --git a/clang/lib/Headers/wasm_simd128.h b/clang/lib/Headers/wasm_simd128.h
index 14e36e85da8efa..fc37c71aad3093 100644
--- a/clang/lib/Headers/wasm_simd128.h
+++ b/clang/lib/Headers/wasm_simd128.h
@@ -982,12 +982,12 @@ static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i8x16_add(v128_t __a,
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i8x16_add_sat(v128_t __a,
                                                                v128_t __b) {
-  return (v128_t)__builtin_wasm_add_sat_s_i8x16((__i8x16)__a, (__i8x16)__b);
+  return (v128_t)__builtin_elementwise_add_sat((__i8x16)__a, (__i8x16)__b);
 }
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_u8x16_add_sat(v128_t __a,
                                                                v128_t __b) {
-  return (v128_t)__builtin_wasm_add_sat_u_i8x16((__u8x16)__a, (__u8x16)__b);
+  return (v128_t)__builtin_elementwise_add_sat((__u8x16)__a, (__u8x16)__b);
 }
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i8x16_sub(v128_t __a,
@@ -1068,12 +1068,12 @@ static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i16x8_add(v128_t __a,
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i16x8_add_sat(v128_t __a,
                                                                v128_t __b) {
-  return (v128_t)__builtin_wasm_add_sat_s_i16x8((__i16x8)__a, (__i16x8)__b);
+  return (v128_t)__builtin_elementwise_add_sat((__i16x8)__a, (__i16x8)__b);
 }
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_u16x8_add_sat(v128_t __a,
                                                                v128_t __b) {
-  return (v128_t)__builtin_wasm_add_sat_u_i16x8((__u16x8)__a, (__u16x8)__b);
+  return (v128_t)__builtin_elementwise_add_sat((__u16x8)__a, (__u16x8)__b);
 }
 
 static __inline__ v128_t __DEFAULT_FN_ATTRS wasm_i16x8_sub(v128_t __a,
diff --git a/clang/test/CodeGen/builtins-wasm.c b/clang/test/CodeGen/builtins-wasm.c
index 8943a92faad044..bca15cd50d4e70 100644
--- a/clang/test/CodeGen/builtins-wasm.c
+++ b/clang/test/CodeGen/builtins-wasm.c
@@ -190,35 +190,6 @@ double max_f64(double x, double y) {
   // WEBASSEMBLY-NEXT: ret
 }
 
-i8x16 add_sat_s_i8x16(i8x16 x, i8x16 y) {
-  return __builtin_wasm_add_sat_s_i8x16(x, y);
-  // MISSING-SIMD: error: '__builtin_wasm_add_sat_s_i8x16' needs target feature simd128
-  // WEBASSEMBLY: call <16 x i8> @llvm.sadd.sat.v16i8(
-  // WEBASSEMBLY-SAME: <16 x i8> %x, <16 x i8> %y)
-  // WEBASSEMBLY-NEXT: ret
-}
-
-u8x16 add_sat_u_i8x16(u8x16 x, u8x16 y) {
-  return __builtin_wasm_add_sat_u_i8x16(x, y);
-  // WEBASSEMBLY: call <16 x i8> @llvm.uadd.sat.v16i8(
-  // WEBASSEMBLY-SAME: <16 x i8> %x, <16 x i8> %y)
-  // WEBASSEMBLY-NEXT: ret
-}
-
-i16x8 add_sat_s_i16x8(i16x8 x, i16x8 y) {
-  return __builtin_wasm_add_sat_s_i16x8(x, y);
-  // WEBASSEMBLY: call <8 x i16> @llvm.sadd.sat.v8i16(
-  // WEBASSEMBLY-SAME: <8 x i16> %x, <8 x i16> %y)
-  // WEBASSEMBLY-NEXT: ret
-}
-
-u16x8 add_sat_u_i16x8(u16x8 x, u16x8 y) {
-  return __builtin_wasm_add_sat_u_i16x8(x, y);
-  // WEBASSEMBLY: call <8 x i16> @llvm.uadd.sat.v8i16(
-  // WEBASSEMBLY-SAME: <8 x i16> %x, <8 x i16> %y)
-  // WEBASSEMBLY-NEXT: ret
-}
-
 i8x16 sub_sat_s_i8x16(i8x16 x, i8x16 y) {
   return __builtin_wasm_sub_sat_s_i8x16(x, y);
   // WEBASSEMBLY: call <16 x i8> @llvm.wasm.sub.sat.signed.v16i8(

``````````

</details>


https://github.com/llvm/llvm-project/pull/109269