diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 61bca2acb30..edcc2d655b7 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -41410,6 +41410,32 @@ ix86_register_move_cost (machine_mode mode, reg_class_t class1_i, return 2; } +/* Implement TARGET_HARD_REGNO_NREGS. This is ordinarily the length in + words of a value of mode MODE but can be less for certain modes in + special long registers. + + Actually there are no two word move instructions for consecutive + registers. And only registers 0-3 may have mov byte instructions + applied to them. */ + +static unsigned int +ix86_hard_regno_nregs (unsigned int regno, machine_mode mode) +{ + if (GENERAL_REGNO_P (regno)) + { + if (mode == XFmode) + return TARGET_64BIT ? 2 : 3; + if (mode == XCmode) + return TARGET_64BIT ? 4 : 6; + return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD); + } + if (COMPLEX_MODE_P (mode)) + return 2; + if (mode == V64SFmode || mode == V64SImode) + return 4; + return 1; +} + /* Implement TARGET_HARD_REGNO_MODE_OK. */ static bool @@ -53376,6 +53402,8 @@ ix86_run_selftests (void) #undef TARGET_NOCE_CONVERSION_PROFITABLE_P #define TARGET_NOCE_CONVERSION_PROFITABLE_P ix86_noce_conversion_profitable_p +#undef TARGET_HARD_REGNO_NREGS +#define TARGET_HARD_REGNO_NREGS ix86_hard_regno_nregs #undef TARGET_HARD_REGNO_MODE_OK #define TARGET_HARD_REGNO_MODE_OK ix86_hard_regno_mode_ok |