Fix comparison bug on ARM.

Retrieves the result of VFP comparison from the VFP status register.

BUG=none
TEST=none

Patch by Martyn Capewell from ARM Ltd.

Review URL: http://codereview.chromium.org/6020014


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6176 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-codegen-arm.cc

@@ -1077,6 +1077,7 @@ void LCodeGen::DoBranch(LBranch* instr) {
   } else if (r.IsDouble()) {
     DoubleRegister reg = ToDoubleRegister(instr->input());
     __ vcmp(reg, 0.0);
+    __ vmrs(pc);  // Move vector status bits to normal status bits.
     EmitBranch(true_block, false_block, ne);
   } else {
     ASSERT(r.IsTagged());
@@ -1114,6 +1115,7 @@ void LCodeGen::DoBranch(LBranch* instr) {
       __ sub(ip, reg, Operand(kHeapObjectTag));
       __ vldr(dbl_scratch, ip, HeapNumber::kValueOffset);
       __ vcmp(dbl_scratch, 0.0);
+      __ vmrs(pc);  // Move vector status bits to normal status bits.
       __ b(eq, false_label);
       __ b(true_label);