ARM: Fix comparison of NaN values....

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
===================================================================
--- src/arm/assembler-arm.cc	(revision 6231)
+++ src/arm/assembler-arm.cc	(working copy)
@@ -2340,12 +2340,14 @@
                      const SBit s,
                      const Condition cond) {
   // vcmp(Dd, Dm) double precision floating point comparison.
+  // We set bit E, as we want any NaN to set the cumulative exception flag
+  // in the FPSCR.
   // Instruction details available in ARM DDI 0406A, A8-570.
   // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0100 (19-16) |
-  // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=? | 1(6) | M(5)=? | 0(4) | Vm(3-0)
+  // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=1 | 1(6) | M(5)=? | 0(4) | Vm(3-0)
   ASSERT(CpuFeatures::IsEnabled(VFP3));
   emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 |
-       src1.code()*B12 | 0x5*B9 | B8 | B6 | src2.code());
+       src1.code()*B12 | 0x5*B9 | B8 | B7 | B6 | src2.code());
 }
 
 
@@ -2355,12 +2357,14 @@
                      const Condition cond) {
   // vcmp(Dd, Dm) double precision floating point comparison.
   // Instruction details available in ARM DDI 0406A, A8-570.
+  // We set bit E, as we want any NaN to set the cumulative exception flag
+  // in the FPSCR.
   // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0101 (19-16) |
-  // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=? | 1(6) | M(5)=? | 0(4) | 0000(3-0)
+  // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=1 | 1(6) | M(5)=? | 0(4) | 0000(3-0)
   ASSERT(CpuFeatures::IsEnabled(VFP3));
   ASSERT(src2 == 0.0);
   emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 | B16 |
-       src1.code()*B12 | 0x5*B9 | B8 | B6);
+       src1.code()*B12 | 0x5*B9 | B8 | B7 | B6);
 }