+2002-09-30 Richard Earnshaw <rearnsha@arm.com>
+
+ * arm.h (BASE_REG_CLASS): Always return LO_REGS for Thumb.
+ (MODE_BASE_REG_CLASS, case Thumb): Only return BASE_REGS if we know
+ that we have a SImode access, and only then if reload hasn't completed;
+ for all other cases, use LO_REGS.
+
2002-09-29 Richard Henderson <rth@redhat.com>
* real.c (real_from_string): Apply sign last. Tidy exponent handling.
/* The class value for index registers, and the one for base regs. */
#define INDEX_REG_CLASS (TARGET_THUMB ? LO_REGS : GENERAL_REGS)
-#define BASE_REG_CLASS (TARGET_THUMB ? BASE_REGS : GENERAL_REGS)
+#define BASE_REG_CLASS (TARGET_THUMB ? LO_REGS : GENERAL_REGS)
-/* For the Thumb the high registers cannot be used as base
- registers when addressing quanitities in QI or HI mode. */
+/* For the Thumb the high registers cannot be used as base registers
+ when addressing quanitities in QI or HI mode; if we don't know the
+ mode, then we must be conservative. After reload we must also be
+ conservative, since we can't support SP+reg addressing, and we
+ can't fix up any bad substitutions. */
#define MODE_BASE_REG_CLASS(MODE) \
- (TARGET_ARM ? BASE_REGS : \
- (((MODE) == QImode || (MODE) == HImode || (MODE) == VOIDmode) \
- ? LO_REGS : BASE_REGS))
+ (TARGET_ARM ? GENERAL_REGS : \
+ (((MODE) == SImode && !reload_completed) ? BASE_REGS : LO_REGS))
/* When SMALL_REGISTER_CLASSES is nonzero, the compiler allows
registers explicitly used in the rtl to be used as spill registers