[turbofan] Fixed the second return value of TryTruncateFloatXXToUint64.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index e22c3441f38f5048a74b7b212ce666cc997b1bfe..d71488c03e2657bee64dabec976835f82ea7f716 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -1060,7 +1060,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArm64Float32ToUint64:
       __ Fcvtzu(i.OutputRegister64(), i.InputFloat32Register(0));
       if (i.OutputCount() > 1) {
-        __ Fcmp(i.InputFloat32Register(0), 0.0);
+        __ Fcmp(i.InputFloat32Register(0), -1.0);

[jbramley, 2015/12/16 12:49:37]

Is -1.0 supposed to be inclusive? If not, "ge" needs to be "gt".

[ahaas, 2015/12/16 16:15:25]

done. I added a test for this case too.

         __ Ccmp(i.OutputRegister(0), -1, ZFlag, ge);
         __ Cset(i.OutputRegister(1), ne);
       }
@@ -1068,7 +1068,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArm64Float64ToUint64:
       __ Fcvtzu(i.OutputRegister64(), i.InputDoubleRegister(0));
       if (i.OutputCount() > 1) {
-        __ Fcmp(i.InputDoubleRegister(0), 0.0);
+        __ Fcmp(i.InputDoubleRegister(0), -1.0);
         __ Ccmp(i.OutputRegister(0), -1, ZFlag, ge);
         __ Cset(i.OutputRegister(1), ne);
       }