+/* NOTE: when testing the platform in this file we must test either
+ * *_HOST_ARCH and *_TARGET_ARCH, depending on whether COMPILING_GHC
+ * is set. This is because when we're compiling the RTS and HC code,
+ * the platform we're running on is the HOST, but when compiling GHC
+ * we want to know about the register mapping on the TARGET platform.
+ */
+#ifdef COMPILING_GHC
+#define alpha_REGS alpha_TARGET_ARCH
+#define hppa1_1_REGS hppa1_1_TARGET_ARCH
+#define i386_REGS i386_TARGET_ARCH
+#define x86_64_REGS x86_64_TARGET_ARCH
+#define m68k_REGS m68k_TARGET_ARCH
+#define mips_REGS (mipsel_TARGET_ARCH || mipseb_TARGET_ARCH)
+#define powerpc_REGS (powerpc_TARGET_ARCH || powerpc64_TARGET_ARCH || rs6000_TARGET_ARCH)
+#define ia64_REGS ia64_TARGET_ARCH
+#define sparc_REGS sparc_TARGET_ARCH
+#define darwin_REGS darwin_TARGET_OS
+#else
+#define alpha_REGS alpha_HOST_ARCH
+#define hppa1_1_REGS hppa1_1_HOST_ARCH
+#define i386_REGS i386_HOST_ARCH
+#define x86_64_REGS x86_64_HOST_ARCH
+#define m68k_REGS m68k_HOST_ARCH
+#define mips_REGS (mipsel_HOST_ARCH || mipseb_HOST_ARCH)
+#define powerpc_REGS (powerpc_HOST_ARCH || powerpc64_HOST_ARCH || rs6000_HOST_ARCH)
+#define ia64_REGS ia64_HOST_ARCH
+#define sparc_REGS sparc_HOST_ARCH
+#define darwin_REGS darwin_HOST_OS
+#endif
+