diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a87fb29d5e3..814250fa24e 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -28263,6 +28263,32 @@ ix86_secondary_memory_needed (enum reg_class class1, enum reg_class class2, return inline_secondary_memory_needed (class1, class2, mode, strict); } +/* Implement the TARGET_CLASS_MAX_NREGS hook. + + On the 80386, this is the size of MODE in words, + except in the FP regs, where a single reg is always enough. */ + +static unsigned char +ix86_class_max_nregs (reg_class_t rclass, enum machine_mode mode) +{ + if (MAYBE_INTEGER_CLASS_P (rclass)) + { + if (mode == XFmode) + return (TARGET_64BIT ? 2 : 3); + else if (mode == XCmode) + return (TARGET_64BIT ? 4 : 6); + else + return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD); + } + else + { + if (COMPLEX_MODE_P (mode)) + return 2; + else + return 1; + } +} + /* Return true if the registers in CLASS cannot represent the change from modes FROM to TO. */ @@ -28459,7 +28485,8 @@ ix86_register_move_cost (enum machine_mode mode, reg_class_t class1_i, /* In case of copying from general_purpose_register we may emit multiple stores followed by single load causing memory size mismatch stall. Count this as arbitrarily high cost of 20. */ - if (CLASS_MAX_NREGS (class1, mode) > CLASS_MAX_NREGS (class2, mode)) + if (targetm.class_max_nregs (class1, mode) + > targetm.class_max_nregs (class2, mode)) cost += 20; /* In the case of FP/MMX moves, the registers actually overlap, and we @@ -34931,6 +34958,9 @@ ix86_autovectorize_vector_sizes (void) #undef TARGET_SECONDARY_RELOAD #define TARGET_SECONDARY_RELOAD ix86_secondary_reload +#undef TARGET_CLASS_MAX_NREGS +#define TARGET_CLASS_MAX_NREGS ix86_class_max_nregs + #undef TARGET_PREFERRED_RELOAD_CLASS #define TARGET_PREFERRED_RELOAD_CLASS ix86_preferred_reload_class #undef TARGET_PREFERRED_OUTPUT_RELOAD_CLASS |