[PowerPC] Implement XL compatibility builtin __addex

Add builtin and intrinsic for `__addex`.

This patch is part of a series of patches to provide builtins for
compatibility with the XL compiler.

Reviewed By: stefanp, nemanjai, NeHuang

Differential Revision: https://reviews.llvm.org/D107002

Author: lei137

clang/include/clang/Basic/BuiltinsPPC.def

@@ -144,6 +144,7 @@ BUILTIN(__builtin_ppc_mfspr, "ULiIi", "")
 BUILTIN(__builtin_ppc_mtmsr, "vUi", "")
 BUILTIN(__builtin_ppc_mtspr, "vIiULi", "")
 BUILTIN(__builtin_ppc_stfiw, "viC*d", "")
+BUILTIN(__builtin_ppc_addex, "LLiLLiLLiCIi", "")
 
 BUILTIN(__builtin_ppc_get_timebase, "ULLi", "n")
 

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -9733,6 +9733,9 @@ def err_argument_invalid_range : Error<
 def warn_argument_invalid_range : Warning<
   "argument value %0 is outside the valid range [%1, %2]">, DefaultError,
   InGroup<DiagGroup<"argument-outside-range">>;
+def warn_argument_undefined_behaviour : Warning<
+  "argument value %0 will result in undefined behaviour">,
+  InGroup<DiagGroup<"argument-undefined-behaviour">>;
 def err_argument_not_multiple : Error<
   "argument should be a multiple of %0">;
 def err_argument_not_power_of_2 : Error<

clang/lib/Basic/Targets/PPC.cpp

@@ -236,6 +236,7 @@ static void defineXLCompatMacros(MacroBuilder &Builder) {
   Builder.defineMacro("__frsqrtes", "__builtin_ppc_frsqrtes");
   Builder.defineMacro("__fsqrt", "__builtin_ppc_fsqrt");
   Builder.defineMacro("__fsqrts", "__builtin_ppc_fsqrts");
+  Builder.defineMacro("__addex", "__builtin_ppc_addex");
 }
 
 /// PPCTargetInfo::getTargetDefines - Return a set of the PowerPC-specific

clang/lib/Sema/SemaChecking.cpp

@@ -3294,6 +3294,7 @@ static bool isPPC_64Builtin(unsigned BuiltinID) {
   case PPC::BI__builtin_ppc_store8r:
   case PPC::BI__builtin_ppc_insert_exp:
   case PPC::BI__builtin_ppc_extract_sig:
+  case PPC::BI__builtin_ppc_addex:
     return true;
   }
   return false;
@@ -3435,6 +3436,19 @@ bool Sema::CheckPPCBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
   case PPC::BI__builtin_ppc_insert_exp:
     return SemaFeatureCheck(*this, TheCall, "power9-vector",
                             diag::err_ppc_builtin_only_on_arch, "9");
+  case PPC::BI__builtin_ppc_addex: {
+    if (SemaFeatureCheck(*this, TheCall, "isa-v30-instructions",
+                         diag::err_ppc_builtin_only_on_arch, "9") ||
+        SemaBuiltinConstantArgRange(TheCall, 2, 0, 3))
+      return true;
+    // Output warning for reserved values 1 to 3.
+    int ArgValue =
+        TheCall->getArg(2)->getIntegerConstantExpr(Context)->getSExtValue();
+    if (ArgValue != 0)
+      Diag(TheCall->getBeginLoc(), diag::warn_argument_undefined_behaviour)
+          << ArgValue;
+    return false;
+  }
   case PPC::BI__builtin_ppc_mtfsb0:
   case PPC::BI__builtin_ppc_mtfsb1:
     return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);

clang/test/CodeGen/builtins-ppc-xlcompat-pwr9-64bit.c

@@ -80,3 +80,19 @@ double insert_exp (double d, unsigned long long ull) {
 // CHECK-NONPWR9-ERR:  error: this builtin is only valid on POWER9 or later CPUs
   return __insert_exp (d, ull);
 }
+
+signed long long test_builtin_ppc_addex0() {
+  // CHECK-LABEL:    @test_builtin_ppc_addex0
+  // CHECK:          %2 = call i64 @llvm.ppc.addex(i64 %0, i64 %1, i32 0)
+  // CHECK-32-ERROR: error: this builtin is only available on 64-bit targets
+  // CHECK-NONPWR9-ERR:  error: this builtin is only valid on POWER9 or later CPUs
+  return __builtin_ppc_addex(sll, sll, 0);
+}
+
+unsigned long long test_builtin_ppc_addex1() {
+  // CHECK-LABEL:    @test_builtin_ppc_addex1
+  // CHECK:          %2 = call i64 @llvm.ppc.addex(i64 %0, i64 %1, i32 0)
+  // CHECK-32-ERROR: error: this builtin is only available on 64-bit targets
+  // CHECK-NONPWR9-ERR:  error: this builtin is only valid on POWER9 or later CPUs
+  return __builtin_ppc_addex(ull, ull, 0);
+}

clang/test/CodeGen/builtins-ppc-xlcompat-pwr9-error.c

@@ -9,7 +9,18 @@
 // RUN:   -fsyntax-only -Wall -Werror -verify %s
 
 extern unsigned int ui;
+extern unsigned long long ull;
+extern long long ll;
 
 void test_builtin_ppc_cmprb() {
   int res = __builtin_ppc_cmprb(3, ui, ui); // expected-error {{argument value 3 is outside the valid range [0, 1]}}
 }
+
+#ifdef __PPC64__
+
+void test_builtin_ppc_addex() {
+  long long res = __builtin_ppc_addex(ll, ll, 4); // expected-error {{argument value 4 is outside the valid range [0, 3]}}
+  unsigned long long res2 = __builtin_ppc_addex(ull, ull, -1); // expected-error {{argument value -1 is outside the valid range [0, 3]}}
+}
+
+#endif

clang/test/CodeGen/builtins-ppc-xlcompat-pwr9-warning.c

@@ -0,0 +1,11 @@
+// REQUIRES: powerpc-registered-target
+// RUN: %clang_cc1 -triple powerpc64-unknown-unknown -target-cpu pwr9 \
+// RUN:   -verify %s
+
+extern unsigned long long ull;
+extern long long ll;
+
+void test_builtin_ppc_addex() {
+  long long res = __builtin_ppc_addex(ll, ll, 1); // expected-warning {{argument value 1 will result in undefined behaviour}}
+  unsigned long long res2 = __builtin_ppc_addex(ull, ull, 3); // expected-warning {{argument value 3 will result in undefined behaviour}}
+}

llvm/include/llvm/IR/IntrinsicsPowerPC.td

@@ -1706,7 +1706,10 @@ let TargetPrefix = "ppc" in {
   def int_ppc_fres
       : GCCBuiltin<"__builtin_ppc_fres">,
         Intrinsic <[llvm_float_ty], [llvm_float_ty], [IntrNoMem]>;
-  
+  def int_ppc_addex
+      : GCCBuiltin<"__builtin_ppc_addex">,
+        Intrinsic<[llvm_i64_ty], [llvm_i64_ty, llvm_i64_ty, llvm_i32_ty],
+                  [IntrNoMem, IntrHasSideEffects, ImmArg<ArgIndex<2>>]>;
   def int_ppc_fsel : GCCBuiltin<"__builtin_ppc_fsel">,
                      Intrinsic<[llvm_double_ty], [llvm_double_ty, llvm_double_ty, 
                                                   llvm_double_ty], [IntrNoMem]>;

llvm/lib/Target/PowerPC/P9InstrResources.td

@@ -1430,5 +1430,6 @@ def : InstRW<[],
   DCBI,
   DCCCI,
   ICCCI,
-  ADDEX
+  ADDEX,
+  ADDEX8
 )> { let Unsupported = 1; }

llvm/lib/Target/PowerPC/PPCInstr64Bit.td

@@ -1670,6 +1670,13 @@ def HASHCHKP : XForm_XD6_RA5_RB5<31, 690, (outs),
                                  "hashchkp $RB, $D_RA_XD", IIC_IntGeneral, []>;
 }
 
+let Interpretation64Bit = 1, isCodeGenOnly = 1, hasSideEffects = 1 in
+def ADDEX8 : Z23Form_RTAB5_CY2<31, 170, (outs g8rc:$rT),
+                              (ins g8rc:$rA, g8rc:$rB, u2imm:$CY),
+                              "addex $rT, $rA, $rB, $CY", IIC_IntGeneral,
+                              [(set i64:$rT, (int_ppc_addex i64:$rA, i64:$rB,
+                                                            timm:$CY))]>;
+
 //===----------------------------------------------------------------------===//
 // Instruction Patterns
 //

llvm/test/CodeGen/PowerPC/builtins-ppc-xlcompat-pwr9-64bit.ll

@@ -29,3 +29,14 @@ entry:
   ret double %0
 }
 declare double @llvm.ppc.insert.exp(double, i64)
+
+declare i64 @llvm.ppc.addex(i64, i64, i32 immarg)
+define dso_local i64 @call_addex_0(i64 %a, i64 %b) {
+; CHECK-LABEL: call_addex_0:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    addex 3, 3, 4, 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = tail call i64 @llvm.ppc.addex(i64 %a, i64 %b, i32 0)
+  ret i64 %0
+}