Some SME instructions use w12-w15 to index ZA. This patch adds a register class for that range.
gcc/ * config/aarch64/aarch64.h (ZA_INDEX_REGNUM_P): New macro. (ZA_INDEX_REGS): New register class. (REG_CLASS_NAMES, REG_CLASS_CONTENTS): Add entries for it. * config/aarch64/aarch64.cc (aarch64_regno_regclass) (aarch64_class_max_nregs, aarch64_register_move_cost): Handle ZA_INDEX_REGS. --- gcc/config/aarch64/aarch64.cc | 12 +++++++----- gcc/config/aarch64/aarch64.h | 6 ++++++ 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index b200d2a9f80..d29cfefee6b 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -13553,6 +13553,9 @@ aarch64_label_mentioned_p (rtx x) enum reg_class aarch64_regno_regclass (unsigned regno) { + if (ZA_INDEX_REGNUM_P (regno)) + return ZA_INDEX_REGS; + if (STUB_REGNUM_P (regno)) return STUB_REGS; @@ -13917,6 +13920,7 @@ aarch64_class_max_nregs (reg_class_t regclass, machine_mode mode) unsigned int nregs, vec_flags; switch (regclass) { + case ZA_INDEX_REGS: case STUB_REGS: case TAILCALL_ADDR_REGS: case POINTER_REGS: @@ -16252,13 +16256,11 @@ aarch64_register_move_cost (machine_mode mode, const struct cpu_regmove_cost *regmove_cost = aarch64_tune_params.regmove_cost; - /* Caller save and pointer regs are equivalent to GENERAL_REGS. */ - if (to == TAILCALL_ADDR_REGS || to == POINTER_REGS - || to == STUB_REGS) + /* Trest any subset of GENERAL_REGS as though it were GENERAL_REGS. */ + if (reg_class_subset_p (to, GENERAL_REGS)) to = GENERAL_REGS; - if (from == TAILCALL_ADDR_REGS || from == POINTER_REGS - || from == STUB_REGS) + if (reg_class_subset_p (from, GENERAL_REGS)) from = GENERAL_REGS; /* Make RDFFR very expensive. In particular, if we know that the FFR diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h index b5877e7e61e..bfa28726221 100644 --- a/gcc/config/aarch64/aarch64.h +++ b/gcc/config/aarch64/aarch64.h @@ -643,6 +643,9 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE = AARCH64_FL_SM_OFF; && (REGNO) != R17_REGNUM \ && (REGNO) != R30_REGNUM) \ +#define ZA_INDEX_REGNUM_P(REGNO) \ + IN_RANGE (REGNO, R12_REGNUM, R15_REGNUM) + #define FP_REGNUM_P(REGNO) \ (((unsigned) (REGNO - V0_REGNUM)) <= (V31_REGNUM - V0_REGNUM)) @@ -666,6 +669,7 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE = AARCH64_FL_SM_OFF; enum reg_class { NO_REGS, + ZA_INDEX_REGS, TAILCALL_ADDR_REGS, STUB_REGS, GENERAL_REGS, @@ -690,6 +694,7 @@ enum reg_class #define REG_CLASS_NAMES \ { \ "NO_REGS", \ + "ZA_INDEX_REGS", \ "TAILCALL_ADDR_REGS", \ "STUB_REGS", \ "GENERAL_REGS", \ @@ -711,6 +716,7 @@ enum reg_class #define REG_CLASS_CONTENTS \ { \ { 0x00000000, 0x00000000, 0x00000000 }, /* NO_REGS */ \ + { 0x0000f000, 0x00000000, 0x00000000 }, /* ZA_INDEX_REGS */ \ { 0x00030000, 0x00000000, 0x00000000 }, /* TAILCALL_ADDR_REGS */\ { 0x3ffcffff, 0x00000000, 0x00000000 }, /* STUB_REGS */ \ { 0x7fffffff, 0x00000000, 0x00000003 }, /* GENERAL_REGS */ \ -- 2.25.1