Set a fixed scratch register for ARM code generation...

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
===================================================================
--- src/arm/assembler-arm.h	(revision 6144)
+++ src/arm/assembler-arm.h	(working copy)
@@ -132,7 +132,7 @@
 const Register r6  = {  6 };
 const Register r7  = {  7 };
 const Register r8  = {  8 };  // Used as context register.
-const Register r9  = {  9 };
+const Register r9  = {  9 };  // Used as lithium codegen scratch register.

[Karl Klose, 2011/01/04 14:25:28]

Perhaps add a STATIC_ASSERT(kNumAllocatableRegisters <= 8) somewhere?

[Søren Thygesen Gjesse, 2011/01/04 14:32:40]

Added an assert to the ToAllocationIndex to assert that only registers r0 - r7
are allocated.

 const Register r10 = { 10 };  // Used as roots register.
 const Register fp  = { 11 };
 const Register ip  = { 12 };