MIPS: [turbofan] Implement Float32Round(TiesEven|RoundUp|RoundDown|Truncate).

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

 // Copyright 2014 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/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
 #include "src/mips/macro-assembler-mips.h"
@@ skipping 174 matching lines @@
     __ srl(at, kScratchReg, 31);
     __ sll(at, at, 31);
     __ Mthc1(at, result_);
   }
 
  private:
   DoubleRegister const result_;
 };
 
 
-class OutOfLineTruncate final : public OutOfLineRound {
+class OutOfLineRound32 : public OutOfLineCode {
  public:
-  OutOfLineTruncate(CodeGenerator* gen, DoubleRegister result)
-      : OutOfLineRound(gen, result) {}
+  OutOfLineRound32(CodeGenerator* gen, DoubleRegister result)
+      : OutOfLineCode(gen), result_(result) {}
+
+  void Generate() final {
+    // Handle rounding to zero case where sign has to be preserved.
+    // High bits of float input already in kScratchReg.
+    __ srl(at, kScratchReg, 31);
+    __ sll(at, at, 31);
+    __ mtc1(at, result_);
+  }
+
+ private:
+  DoubleRegister const result_;
 };
 
 
-class OutOfLineFloor final : public OutOfLineRound {
- public:
-  OutOfLineFloor(CodeGenerator* gen, DoubleRegister result)
-      : OutOfLineRound(gen, result) {}
-};
-
-
-class OutOfLineCeil final : public OutOfLineRound {
- public:
-  OutOfLineCeil(CodeGenerator* gen, DoubleRegister result)
-      : OutOfLineRound(gen, result) {}
-};
-
-
-class OutOfLineTiesEven final : public OutOfLineRound {
- public:
-  OutOfLineTiesEven(CodeGenerator* gen, DoubleRegister result)
-      : OutOfLineRound(gen, result) {}
-};
-
-
 class OutOfLineRecordWrite final : public OutOfLineCode {
  public:
   OutOfLineRecordWrite(CodeGenerator* gen, Register object, Register index,
                        Register value, Register scratch0, Register scratch1,
                        RecordWriteMode mode)
       : OutOfLineCode(gen),
         object_(object),
         index_(index),
         value_(value),
         scratch0_(scratch0),
@@ skipping 192 matching lines @@
     } else {                                                           \
       auto offset = i.InputOperand(0).immediate();                     \
       auto value = i.InputRegister(2);                                 \
       __ Branch(&done, ls, i.InputRegister(1), Operand(offset));       \
       __ asm_instr(value, MemOperand(i.InputRegister(3), offset));     \
     }                                                                  \
     __ bind(&done);                                                    \
   } while (0)
 
 
-#define ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(asm_instr, operation)                  \
+#define ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(asm_instr)                             \
   do {                                                                         \
-    auto ool =                                                                 \
-        new (zone()) OutOfLine##operation(this, i.OutputDoubleRegister());     \
+    auto ool = new (zone()) OutOfLineRound(this, i.OutputDoubleRegister());    \
     Label done;                                                                \
     __ Mfhc1(kScratchReg, i.InputDoubleRegister(0));                           \
     __ Ext(at, kScratchReg, HeapNumber::kExponentShift,                        \
            HeapNumber::kExponentBits);                                         \
     __ Branch(USE_DELAY_SLOT, &done, hs, at,                                   \
               Operand(HeapNumber::kExponentBias + HeapNumber::kMantissaBits)); \
     __ mov_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0));              \
     __ asm_instr(i.OutputDoubleRegister(), i.InputDoubleRegister(0));          \
     __ Move(at, kScratchReg2, i.OutputDoubleRegister());                       \
     __ or_(at, at, kScratchReg2);                                              \
     __ Branch(USE_DELAY_SLOT, ool->entry(), eq, at, Operand(zero_reg));        \
     __ cvt_d_l(i.OutputDoubleRegister(), i.OutputDoubleRegister());            \
     __ bind(ool->exit());                                                      \
     __ bind(&done);                                                            \
   } while (0)
 
 
+#define ASSEMBLE_ROUND_FLOAT_TO_FLOAT(asm_instr)                              \
+  do {                                                                        \
+    int32_t kFloat32ExponentBias = 127;                                       \
+    int32_t kFloat32MantissaBits = 23;                                        \
+    int32_t kFloat32ExponentBits = 8;                                         \
+    auto ool = new (zone()) OutOfLineRound32(this, i.OutputDoubleRegister()); \
+    Label done;                                                               \
+    __ mfc1(kScratchReg, i.InputDoubleRegister(0));                           \
+    __ Ext(at, kScratchReg, kFloat32MantissaBits, kFloat32ExponentBits);      \
+    __ Branch(USE_DELAY_SLOT, &done, hs, at,                                  \
+              Operand(kFloat32ExponentBias + kFloat32MantissaBits));          \
+    __ mov_s(i.OutputDoubleRegister(), i.InputDoubleRegister(0));             \
+    __ asm_instr(i.OutputDoubleRegister(), i.InputDoubleRegister(0));         \
+    __ mfc1(at, i.OutputDoubleRegister());                                    \
+    __ Branch(USE_DELAY_SLOT, ool->entry(), eq, at, Operand(zero_reg));       \
+    __ cvt_s_w(i.OutputDoubleRegister(), i.OutputDoubleRegister());           \
+    __ bind(ool->exit());                                                     \
+    __ bind(&done);                                                           \
+  } while (0)
+
 void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   int sp_slot_delta = TailCallFrameStackSlotDelta(stack_param_delta);
   if (sp_slot_delta > 0) {
     __ addiu(sp, sp, sp_slot_delta * kPointerSize);
   }
   if (frame()->needs_frame()) {
     __ Pop(ra, fp);
   }
   frame_access_state()->SetFrameAccessToDefault();
 }
@@ skipping 337 matching lines @@
     }
     case kMipsMaxD:
       __ max_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMipsMinD:
       __ min_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMipsFloat64RoundDown: {
-      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(floor_l_d, Floor);
+      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(floor_l_d);
+      break;
+    }
+    case kMipsFloat32RoundDown: {
+      ASSEMBLE_ROUND_FLOAT_TO_FLOAT(floor_w_s);
       break;
     }
     case kMipsFloat64RoundTruncate: {
-      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(trunc_l_d, Truncate);
+      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(trunc_l_d);
+      break;
+    }
+    case kMipsFloat32RoundTruncate: {
+      ASSEMBLE_ROUND_FLOAT_TO_FLOAT(trunc_w_s);
       break;
     }
     case kMipsFloat64RoundUp: {
-      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(ceil_l_d, Ceil);
+      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(ceil_l_d);
+      break;
+    }
+    case kMipsFloat32RoundUp: {
+      ASSEMBLE_ROUND_FLOAT_TO_FLOAT(ceil_w_s);
       break;
     }
     case kMipsFloat64RoundTiesEven: {
-      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(round_l_d, TiesEven);
+      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(round_l_d);
+      break;
+    }
+    case kMipsFloat32RoundTiesEven: {
+      ASSEMBLE_ROUND_FLOAT_TO_FLOAT(round_w_s);
       break;
     }
     case kMipsFloat64Max: {
       // (b < a) ? a : b
       if (IsMipsArchVariant(kMips32r6)) {
         __ cmp_d(OLT, i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
         __ sel_d(i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
       } else {
@@ skipping 776 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8