diff options
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/arm/arm.h | 14 |
2 files changed, 15 insertions, 6 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6bd1e0e..15dfb25 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +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. diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index 9c0ce44..3b3e38a 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -1070,14 +1070,16 @@ enum reg_class /* 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 |