[turbofan] Change TruncateFloat32ToUint64 to TryTruncateFloat32ToUint64.

src/mips64/macro-assembler-mips64.cc

 // Copyright 2012 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 <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
@@ skipping 1620 matching lines @@
 }
 
 void MacroAssembler::Trunc_ul_d(FPURegister fd, FPURegister fs,
                                 FPURegister scratch, Register result) {
   Trunc_ul_d(fs, t8, scratch, result);
   dmtc1(t8, fd);
 }
 
 
 void MacroAssembler::Trunc_ul_s(FPURegister fd, FPURegister fs,
-                                FPURegister scratch) {
-  Trunc_ul_s(fs, t8, scratch);
+                                FPURegister scratch, Register result) {
+  Trunc_ul_s(fs, t8, scratch, result);
   dmtc1(t8, fd);
 }
 
 
 void MacroAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
   trunc_w_d(fd, fs);
 }
 
 
 void MacroAssembler::Round_w_d(FPURegister fd, FPURegister fs) {
@@ skipping 42 matching lines @@
 
   bind(&done);
 }
 
 
 void MacroAssembler::Trunc_ul_d(FPURegister fd, Register rs,
                                 FPURegister scratch, Register result) {
   DCHECK(!fd.is(scratch));
   DCHECK(!AreAliased(rs, result, at));
 
+  Label simple_convert, done, fail;
   if (result.is_valid()) {
     mov(result, zero_reg);
     Move(kDoubleRegZero, 0.0);
+    // If fd < 0 or unordered, then the conversion fails.
+    BranchF(&fail, &fail, lt, fd, kDoubleRegZero);
   }
 
   // Load 2^63 into scratch as its double representation.
   li(at, 0x43e0000000000000);
   dmtc1(at, scratch);
 
   // Test if scratch > fd.
   // If fd < 2^63 we can convert it normally.
-  // If fd is unordered the conversion fails.
-  Label simple_convert, done, fail;
-  BranchF(&simple_convert, &fail, lt, fd, scratch);
+  BranchF(&simple_convert, nullptr, lt, fd, scratch);
 
   // First we subtract 2^63 from fd, then trunc it to rs
   // and add 2^63 to rs.
   sub_d(scratch, fd, scratch);
   trunc_l_d(scratch, scratch);
   dmfc1(rs, scratch);
   Or(rs, rs, Operand(1UL << 63));
   Branch(&done);
 
   // Simple conversion.
   bind(&simple_convert);
   trunc_l_d(scratch, fd);
   dmfc1(rs, scratch);
 
   bind(&done);
   if (result.is_valid()) {
-    // Conversion is failed if the result is negative or unordered.
-    BranchF(&fail, &fail, lt, scratch, kDoubleRegZero);
-    li(result, Operand(1));
+    // Conversion is failed if the result is negative.
+    addiu(at, zero_reg, -1);
+    dsrl(at, at, 1);  // Load 2^62.
+    dmfc1(result, scratch);
+    xor_(result, result, at);
+    Slt(result, zero_reg, result);
   }
 
   bind(&fail);
 }
 
 
 void MacroAssembler::Trunc_ul_s(FPURegister fd, Register rs,
-                                FPURegister scratch) {
+                                FPURegister scratch, Register result) {
   DCHECK(!fd.is(scratch));
-  DCHECK(!rs.is(at));
+  DCHECK(!AreAliased(rs, result, at));
+
+  Label simple_convert, done, fail;
+  if (result.is_valid()) {
+    mov(result, zero_reg);
+    Move(kDoubleRegZero, 0.0);
+    // If fd < 0 or unordered, then the conversion fails.
+    BranchF32(&fail, &fail, lt, fd, kDoubleRegZero);
+  }
 
   // Load 2^63 into scratch as its float representation.
   li(at, 0x5f000000);
-  dmtc1(at, scratch);
+  mtc1(at, scratch);
 
   // Test if scratch > fd.
   // If fd < 2^63 we can convert it normally.
-  Label simple_convert, done;
-  BranchF32(&simple_convert, NULL, lt, fd, scratch);
+  BranchF32(&simple_convert, nullptr, lt, fd, scratch);
 
   // First we subtract 2^63 from fd, then trunc it to rs
   // and add 2^63 to rs.
   sub_s(scratch, fd, scratch);
   trunc_l_s(scratch, scratch);
   dmfc1(rs, scratch);
   Or(rs, rs, Operand(1UL << 63));
   Branch(&done);
 
   // Simple conversion.
   bind(&simple_convert);
   trunc_l_s(scratch, fd);
   dmfc1(rs, scratch);
 
   bind(&done);
+  if (result.is_valid()) {
+    // Conversion is failed if the result is negative or unordered.
+    addiu(at, zero_reg, -1);
+    dsrl(at, at, 1);  // Load 2^62.
+    dmfc1(result, scratch);
+    xor_(result, result, at);
+    Slt(result, zero_reg, result);
+  }
+
+  bind(&fail);
 }
 
 
 void MacroAssembler::Madd_d(FPURegister fd, FPURegister fr, FPURegister fs,
     FPURegister ft, FPURegister scratch) {
   if (0) {  // TODO(plind): find reasonable arch-variant symbol names.
     madd_d(fd, fr, fs, ft);
   } else {
     // Can not change source regs's value.
     DCHECK(!fr.is(scratch) && !fs.is(scratch) && !ft.is(scratch));
@@ skipping 4517 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64