In order to support the upcoming named address spaces, a 24-bit wide mode is needed because 32-bit mode is too expensive. As a byproduct, 24-bit arithmetic can be exposed to user for general integer arithmetic by means of built-in types. This is advantageous if 32-bit arithmetic is too expensive and 16-bit arithmetic is too unprecise.
Author: gjl Date: Fri Nov 4 16:20:18 2011 New Revision: 180962 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180962 Log: gcc/ PR target/50931 * config/avr/avr-modes.def: New file defining PSImode. * config/avr/avr-c.c (__INT24_MAX__, __INT24_MIN__, __UINT24_MAX__): New built-in defines. * config/avr/avr.md (adjust_len): Add tstpsi, mov24, reload_in24, ashlpsi, ashrpsi, lshrpsi. (QISO, QIDI, HISI, HIDI, MPUSH, rotx, rotsmode): Add PSI. (MOVMODE): New mode iterator. (movpsi): New expander. (movqi, movhi, movsi, movsf, movpsi): Write as one using MOVMODE. (*reload_inpsi, *movpsi): New insns. (*reload_inpsi): New RTL peephole. (addpsi3, *addpsi3_zero_extend.qi, *addpsi3_zero_extend.hi, *addpsi3_sign_extend.hi): New insns. (subpsi3, *subpsi3_zero_extend.qi, *subpsi3_zero_extend.hi, *subpsi3_sign_extend.hi): New insns. (divmodpsi4, udivmodpsi4): New define insn-and-split. (*divmodpsi4_call, *udivmodpsi4_call): New insns. (andpsi3, iorpsi3, xorpsi3): New insns. (*rotlpsi2.1, *rotlpsi2.23): New insns. (*rotw<mode>): Insn condition only allow even-sized modes. (*rotb<mode>): Insn condition allows odd-sized modes. (ashlpsi3, ashrpsi3, lshrpsi3, *addpsi3.lt0): New insns. (negpsi2, one_cmplpsi2): New insns. (extendqipsi2, extendhipsi2, extendpsisi2): New insns. (zero_extendqipsi2, zero_extendhipsi2, zero_extendpsisi2): New insn-and-splits. (*cmppsi, *negated_tstpsi, *reversed_tstpsi): New insns. (cbranchpsi4): New expander. * config/avr/constraints.md (Ca3, Co3, Cx3): New constraints. * config/avr/avr-protos.h (avr_out_tstpsi, avr_out_movpsi, avr_out_ashlpsi3, avr_out_ashrpsi3, avr_out_lshrpsi3, avr_out_reload_inpsi): New prototypes. * config/avr/avr.c (TARGET_SCALAR_MODE_SUPPORTED_P): Define to... (avr_scalar_mode_supported_p): ...this new static function. (avr_asm_len): Always return "". (avr_out_load_psi, avr_out_store_psi): New static functions. (avr_out_movpsi, avr_out_reload_inpsi): New functions. (avr_out_tstpsi): New function. (avr_out_ashlpsi3, avr_out_ashrpsi3, avr_out_lshrpsi3): New functions. (avr_out_plus_1, output_reload_in_const): Handle 3-byte types. (avr_simplify_comparison_p): Ditto. (adjust_insn_length): Handle ADJUST_LEN_RELOAD_IN24, ADJUST_LEN_MOV24, ADJUST_LEN_TSTPSI, ADJUST_LEN_ASHLPSI, ADJUST_LEN_ASHRPSI, ADJUST_LEN_LSHRPSI. (avr_rtx_costs_1): Report PSI costs. (avr_libcall_value): Handle odd-sized parameters. (avr_init_builtin_int24): New static function to define built-in 24-bit types __int24 and __uint24. (avr_init_builtins): Use it. libgcc/ PR target/50931 * config/t-avr (LIB1ASMFUNCS): Add _divmodpsi4, _udivmodpsi4. * config/lib1funcs.S (__udivmodpsi4, __divmodpsi4): New functions. Added: trunk/gcc/config/avr/avr-modes.def Modified: trunk/gcc/ChangeLog trunk/gcc/config/avr/avr-c.c trunk/gcc/config/avr/avr-protos.h trunk/gcc/config/avr/avr.c trunk/gcc/config/avr/avr.md trunk/gcc/config/avr/constraints.md trunk/libgcc/ChangeLog trunk/libgcc/config/avr/lib1funcs.S trunk/libgcc/config/avr/t-avr
Author: gjl Date: Wed Dec 14 10:00:56 2011 New Revision: 182328 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182328 Log: libgcc/ PR target/50931 * config/avr/t-avr (LIB1ASMSRC): Add _mulpsi3, _mulsqipsi3. * config/avr/lib1funcs.S (__mulpsi3, __mulsqipsi3): New functions. gcc/ PR target/50931 * config/avr/avr.md (mulpsi3): New expander. (*umulqihipsi3, *umulhiqipsi3): New insns. (*mulsqipsi3.libgcc, *mulpsi3.libgcc): New insns. (mulsqipsi3, *mulpsi3): New insn-and-splits. (ashlpsi3): Turn to expander. Move insn code to... (*ashlpsi3): ...this new insn. testsuite/ PR target/50931 * gcc.target/avr/torture/int24-mul.c: New testcase. Added: trunk/gcc/testsuite/gcc.target/avr/torture/int24-mul.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/avr/avr.md trunk/gcc/testsuite/ChangeLog trunk/libgcc/ChangeLog trunk/libgcc/config/avr/lib1funcs.S trunk/libgcc/config/avr/t-avr
GCC 4.7.0 is being released, adjusting target milestone.
Fixed in 4.7.0 (up to documentation)