S390: [turbofan] Prevent storing signalling NaNs into holey double arrays.

src/compiler/s390/code-generator-s390.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 378 matching lines @@
   do {                                                                         \
     /* TODO(bmeurer): We should really get rid of this special instruction, */ \
     /* and generate a CallAddress instruction instead. */                      \
     FrameScope scope(masm(), StackFrame::MANUAL);                              \
     __ PrepareCallCFunction(0, 1, kScratchReg);                                \
     __ MovToFloatParameter(i.InputDoubleRegister(0));                          \
     __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()),  \
                      0, 1);                                                    \
     /* Move the result in the double result register. */                       \
     __ MovFromFloatResult(i.OutputDoubleRegister());                           \
-    DCHECK_EQ(LeaveRC, i.OutputRCBit());                                       \
   } while (0)
 
 #define ASSEMBLE_IEEE754_BINOP(name)                                           \
   do {                                                                         \
     /* TODO(bmeurer): We should really get rid of this special instruction, */ \
     /* and generate a CallAddress instruction instead. */                      \
     FrameScope scope(masm(), StackFrame::MANUAL);                              \
     __ PrepareCallCFunction(0, 2, kScratchReg);                                \
     __ MovToFloatParameters(i.InputDoubleRegister(0),                          \
                             i.InputDoubleRegister(1));                         \
     __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()),  \
                      0, 2);                                                    \
     /* Move the result in the double result register. */                       \
     __ MovFromFloatResult(i.OutputDoubleRegister());                           \
-    DCHECK_EQ(LeaveRC, i.OutputRCBit());                                       \
   } while (0)
 
 #define ASSEMBLE_FLOAT_MAX(double_scratch_reg, general_scratch_reg) \
   do {                                                              \
     Label ge, done;                                                 \
     __ cdbr(i.InputDoubleRegister(0), i.InputDoubleRegister(1));    \
     __ bge(&ge, Label::kNear);                                      \
     __ Move(i.OutputDoubleRegister(), i.InputDoubleRegister(1));    \
     __ b(&done, Label::kNear);                                      \
     __ bind(&ge);                                                   \
@@ skipping 913 matching lines @@
       break;
 #if V8_TARGET_ARCH_S390X
     case kS390_Tst64:
       if (HasRegisterInput(instr, 1)) {
         __ AndP(r0, i.InputRegister(0), i.InputRegister(1));
       } else {
         __ AndP(r0, i.InputRegister(0), i.InputImmediate(1));
       }
       break;
 #endif
+    case kS390_Float64SilenceNaN: {
+      DoubleRegister value = i.InputDoubleRegister(0);
+      DoubleRegister result = i.OutputDoubleRegister();
+      __ CanonicalizeNaN(result, value);
+      break;
+    }
     case kS390_Push:
       if (instr->InputAt(0)->IsFPRegister()) {
         __ lay(sp, MemOperand(sp, -kDoubleSize));
         __ StoreDouble(i.InputDoubleRegister(0), MemOperand(sp));
         frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
       } else {
         __ Push(i.InputRegister(0));
         frame_access_state()->IncreaseSPDelta(1);
       }
       break;
@@ skipping 837 matching lines @@
       padding_size -= 2;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8