[turbofan] Change TruncateFloat32ToInt64 to TryTruncateFloat32ToInt64.

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 3683740b8924065cdf3b5cc283d9a99bc1086c4d..f40163fa93c5778279701d26de4b1bfe49f9c1e6 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -1079,9 +1079,30 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     }
     case kMips64TruncLS: {
       FPURegister scratch = kScratchDoubleReg;
+      Register tmp_fcsr = kScratchReg;
+      Register result = kScratchReg2;
+
+      bool load_status = instr->OutputCount() > 1;
+      if (load_status) {
+        // Save FCSR.
+        __ cfc1(tmp_fcsr, FCSR);
+        // Clear FPU flags.
+        __ ctc1(zero_reg, FCSR);
+      }
       // Other arches use round to zero here, so we follow.
       __ trunc_l_s(scratch, i.InputDoubleRegister(0));
       __ dmfc1(i.OutputRegister(), scratch);
+      if (load_status) {
+        __ cfc1(result, FCSR);
+        // Check for overflow and NaNs.
+        __ andi(result, result,
+                (kFCSROverflowFlagMask | kFCSRInvalidOpFlagMask));
+        __ Slt(result, zero_reg, result);
+        __ xori(result, result, 1);
+        __ mov(i.OutputRegister(1), result);
+        // Restore FCSR
+        __ ctc1(tmp_fcsr, FCSR);
+      }
       break;
     }
     case kMips64TruncLD: {