https://gcc.gnu.org/g:07e78425476eb1054d7e0973d6ef39ba73b62821
commit r17-2700-g07e78425476eb1054d7e0973d6ef39ba73b62821 Author: Georg-Johann Lay <[email protected]> Date: Sat Jul 25 15:14:50 2026 +0200 AVR: Add __negdi2_r10 to libgcc. This patch introduces __negdi2_r10 to lib1funcs.S and tidies some 64-bit negations. libgcc/ * config/avr/t-avr (FUNCS_notiny): Add _negdi2_r10. * config/avr/lib1funcs.S (__negdi2_r10): New function. (__divdi3_moddi3): Use it. * config/avr/lib1funcs-fixed.S (__mulQ64_work): Use it. Diff: --- libgcc/config/avr/lib1funcs-fixed.S | 36 ++---------------------------------- libgcc/config/avr/lib1funcs.S | 31 +++++++++++++++++-------------- libgcc/config/avr/t-avr | 2 +- 3 files changed, 20 insertions(+), 49 deletions(-) diff --git a/libgcc/config/avr/lib1funcs-fixed.S b/libgcc/config/avr/lib1funcs-fixed.S index 37f8151480da..f1b61e12e976 100644 --- a/libgcc/config/avr/lib1funcs-fixed.S +++ b/libgcc/config/avr/lib1funcs-fixed.S @@ -1154,40 +1154,8 @@ DEFUN __mulQ64_work eor __tmp_reg__, B7 push __tmp_reg__ - ;; A = |A| - .call_if_neg A7, __negdi2 - - ;; Stash away |A| - wmov r26, A6 -#ifdef __AVR_HAVE_MUL__ - wmov r0, A4 -#else - push A5 - push A4 -#endif - push A3 - push A2 - push A1 - push A0 - - ;; A = |B| - mov8 A0, B0 - .call_if_neg A7, __negdi2 - - ;; Restore B = |A| - wmov B6, r26 - pop B0 - pop B1 - pop B2 - pop B3 -#ifdef __AVR_HAVE_MUL__ - wmov B4, r0 - ;; No need to clear zero_reg since it won't be used until the - ;; next MUL in __umulditi3_raw -> __umulsidi3 -> __umulhisi3. -#else - pop B4 - pop B5 -#endif + .call_if_neg A7, __negdi2 ; A = |A| + .call_if_neg B7, __negdi2_r10 ; B = |B| set ; for signed XICALL ; __muluxx3.2 diff --git a/libgcc/config/avr/lib1funcs.S b/libgcc/config/avr/lib1funcs.S index 150cf82336a6..f780a6965dc4 100644 --- a/libgcc/config/avr/lib1funcs.S +++ b/libgcc/config/avr/lib1funcs.S @@ -1816,26 +1816,15 @@ DEFUN __divdi3_moddi3 22: ldi NN, 1 << 7 eor SS, NN - ldi NN, -1 - com B4 $ com B5 $ com B6 $ com B7 - $ com B1 $ com B2 $ com B3 - NEG B0 - $ sbc B1,NN $ sbc B2,NN $ sbc B3,NN - sbc B4,NN $ sbc B5,NN $ sbc B6,NN $ sbc B7,NN + XCALL __negdi2_r10 3: ;; Do the unsigned 64-Bit Division/Modulo (depending on T-flag) XCALL __udivmod64 ;; Adjust Result's Sign -#ifdef __AVR_ERRATA_SKIP_JMP_CALL__ - tst SS - brpl 4f -#else - sbrc SS, 7 -#endif /* __AVR_HAVE_JMP_CALL__ */ - XCALL __negdi2 + .call_if_neg SS, __negdi2 -4: ;; Epilogue: Restore 12 Registers and return + ;; Epilogue: Restore 12 Registers and return do_epilogue_restores 12 ENDF __divdi3_moddi3 @@ -1931,6 +1920,20 @@ DEFUN __negdi2 ENDF __negdi2 #endif /* L_negdi2 */ +#if defined (L_negdi2_r10) +;; (set (reg:DI 10) +;; (neg:DI (reg:DI 10))) +;; Requires zero_reg R1 = 0. +DEFUN __negdi2_r10 + COM B7 $ com B6 $ com B5 $ com B4 + com B3 $ com B2 $ com B1 $ com B0 + + ADC B0, r1 $ adc B1, r1 $ adc B2, r1 $ adc B3, r1 + adc B4, r1 $ adc B5, r1 $ adc B6, r1 $ adc B7, r1 + ret +ENDF __negdi2_r10 +#endif /* L_negdi2_r10 */ + #undef TT #undef C7 diff --git a/libgcc/config/avr/t-avr b/libgcc/config/avr/t-avr index df85485e0a79..657c61a56664 100644 --- a/libgcc/config/avr/t-avr +++ b/libgcc/config/avr/t-avr @@ -67,7 +67,7 @@ FUNCS_notiny = \ _mulsidi3 _umulsidi3 \ _divdi3 _udivdi3 \ _udivmod64 \ - _negdi2 \ + _negdi2 _negdi2_r10 \ _prologue \ _epilogue \ _load_3 _load_4 \
