diff options
Diffstat (limited to 'gcc/config/arm/arm.c')
| -rw-r--r-- | gcc/config/arm/arm.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 9af66dd8ace..5522fc12172 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -82,6 +82,7 @@ static int arm_legitimate_index_p (enum machine_mode, rtx, RTX_CODE, int); static int thumb2_legitimate_index_p (enum machine_mode, rtx, int); static int thumb1_base_register_rtx_p (rtx, enum machine_mode, int); static rtx arm_legitimize_address (rtx, rtx, enum machine_mode); +static reg_class_t arm_preferred_reload_class (rtx, reg_class_t); static rtx thumb_legitimize_address (rtx, rtx, enum machine_mode); inline static int thumb1_index_register_rtx_p (rtx, int); static bool arm_legitimate_address_p (enum machine_mode, rtx, bool); @@ -576,6 +577,9 @@ static const struct attribute_spec arm_attribute_table[] = #undef TARGET_LEGITIMATE_ADDRESS_P #define TARGET_LEGITIMATE_ADDRESS_P arm_legitimate_address_p +#undef TARGET_PREFERRED_RELOAD_CLASS +#define TARGET_PREFERRED_RELOAD_CLASS arm_preferred_reload_class + #undef TARGET_INVALID_PARAMETER_TYPE #define TARGET_INVALID_PARAMETER_TYPE arm_invalid_parameter_type @@ -6226,6 +6230,30 @@ arm_legitimate_address_p (enum machine_mode mode, rtx x, bool strict_p) return thumb1_legitimate_address_p (mode, x, strict_p); } +/* Worker function for TARGET_PREFERRED_RELOAD_CLASS. + + Given an rtx X being reloaded into a reg required to be + in class CLASS, return the class of reg to actually use. + In general this is just CLASS, but for the Thumb core registers and + immediate constants we prefer a LO_REGS class or a subset. */ + +static reg_class_t +arm_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, reg_class_t rclass) +{ + if (TARGET_32BIT) + return rclass; + else + { + if (rclass == GENERAL_REGS + || rclass == HI_REGS + || rclass == NO_REGS + || rclass == STACK_REG) + return LO_REGS; + else + return rclass; + } +} + /* Build the SYMBOL_REF for __tls_get_addr. */ static GTY(()) rtx tls_get_addr_libfunc; |