diff options
Diffstat (limited to 'gcc/config/s390/s390.c')
| -rw-r--r-- | gcc/config/s390/s390.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c index 1319f68..f62d740 100644 --- a/gcc/config/s390/s390.c +++ b/gcc/config/s390/s390.c @@ -4409,6 +4409,35 @@ s390_secondary_reload (bool in_p, rtx x, reg_class_t rclass_i, return NO_REGS; } +/* Implement TARGET_SECONDARY_MEMORY_NEEDED. + + We need secondary memory to move data between GPRs and FPRs. + + - With DFP the ldgr lgdr instructions are available. Due to the + different alignment we cannot use them for SFmode. For 31 bit a + 64 bit value in GPR would be a register pair so here we still + need to go via memory. + + - With z13 we can do the SF/SImode moves with vlgvf. Due to the + overlapping of FPRs and VRs we still disallow TF/TD modes to be + in full VRs so as before also on z13 we do these moves via + memory. + + FIXME: Should we try splitting it into two vlgvg's/vlvg's instead? */ + +static bool +s390_secondary_memory_needed (machine_mode mode, + reg_class_t class1, reg_class_t class2) +{ + return (((reg_classes_intersect_p (class1, VEC_REGS) + && reg_classes_intersect_p (class2, GENERAL_REGS)) + || (reg_classes_intersect_p (class1, GENERAL_REGS) + && reg_classes_intersect_p (class2, VEC_REGS))) + && (!TARGET_DFP || !TARGET_64BIT || GET_MODE_SIZE (mode) != 8) + && (!TARGET_VX || (SCALAR_FLOAT_MODE_P (mode) + && GET_MODE_SIZE (mode) > 8))); +} + /* Implement TARGET_SECONDARY_MEMORY_NEEDED_MODE. get_secondary_mem widens its argument to BITS_PER_WORD which loses on 64bit @@ -15972,6 +16001,8 @@ s390_asan_shadow_offset (void) #undef TARGET_SECONDARY_RELOAD #define TARGET_SECONDARY_RELOAD s390_secondary_reload +#undef TARGET_SECONDARY_MEMORY_NEEDED +#define TARGET_SECONDARY_MEMORY_NEEDED s390_secondary_memory_needed #undef TARGET_SECONDARY_MEMORY_NEEDED_MODE #define TARGET_SECONDARY_MEMORY_NEEDED_MODE s390_secondary_memory_needed_mode |