ARM: Enable the subnormal floats on QNX.

src/platform-qnx.cc

Index: src/platform-qnx.cc
diff --git a/src/platform-qnx.cc b/src/platform-qnx.cc
index cd031e795648c69d5dc910761c6e7394f6b59793..710345854b79741d2aa525c61cd8613e471b0813 100644
--- a/src/platform-qnx.cc
+++ b/src/platform-qnx.cc
@@ -107,6 +107,21 @@ bool OS::ArmUsingHardFloat() {
 #undef GCC_VERSION
 }
 
+
+void OS::ArmEnableSubnormalFloat() {
+  // Clear the ARM_VFP_FPSCR_FZ flag in the FPSCR register.
+  uint32_t fpscr;
+  asm volatile("vmrs %0, fpscr" : "=r"(fpscr));
+  fpscr &= ~0x01000000u;
+  asm volatile("vmsr fpscr, %0" : : "r"(fpscr));

[Sven Panne, 2014/01/07 09:48:49]

I think a single parameter-less asm with 3 instructions would be more readable
than this asm/C++/asm dance.

+}
+
+struct QnxArmStaticInitializer {
+  QnxArmStaticInitializer() {
+    OS::ArmEnableSubnormalFloat();
+  }
+} qnx_arm_static_initializer;

[Sven Panne, 2014/01/07 09:48:49]

No new static initializers, please, use V8::InitializeOncePerProcessImpl when
really needed.

+
 #endif  // __arm__