Index: compiler-rt/lib/builtins/CMakeLists.txt =================================================================== --- compiler-rt/lib/builtins/CMakeLists.txt +++ compiler-rt/lib/builtins/CMakeLists.txt @@ -672,6 +672,9 @@ avr/mulqi3.S avr/mulhi3.S avr/exit.S + avr/divmodhi4.S + avr/udivmodhi4.S + avr/udivmodqi4.S ) add_custom_target(builtins) Index: compiler-rt/lib/builtins/avr/divmodhi4.S =================================================================== --- /dev/null +++ compiler-rt/lib/builtins/avr/divmodhi4.S @@ -0,0 +1,57 @@ +//===------------- divmodhi4.S - sint16 div & mod -------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// As described at +// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the +// prototype is `struct {sint16, sint16} __divmodhi4(sint16, sint16)`. +// The sint16 quotient is returned via R23:R22, and the sint16 remainder is +// returned via R25:R24, while registers R21/R26/27/Rtmp and bit T in SREG +// are clobbered. +// +//===----------------------------------------------------------------------===// + + .text + .align 2 + +#ifdef __AVR_TINY__ + .set rtmp, 16 +#else + .set rtmp, 0 +#endif + + .globl __divmodhi4 + .type __divmodhi4, @function + +__divmodhi4: + bst r25, 7 + mov rtmp, r23 + brtc __divmodhi4_a + com rtmp + rcall __divmodhi4_b + +__divmodhi4_a: + sbrc r23, 7 + rcall __divmodhi4_c + rcall __udivmodhi4 ; Call __udivmodhi4 to do real calculation. + sbrc rtmp, 7 + rcall __divmodhi4_c + brtc __divmodhi4_exit + +__divmodhi4_b: + com r25 + neg r24 + sbci r25, 255 + ret ; Return quotient via R23:R22 and remainder via R25:R24. + +__divmodhi4_c: + com r23 + neg r22 + sbci r23, 255 + +__divmodhi4_exit: + ret ; Return quotient via R23:R22 and remainder via R25:r24. Index: compiler-rt/lib/builtins/avr/udivmodhi4.S =================================================================== --- /dev/null +++ compiler-rt/lib/builtins/avr/udivmodhi4.S @@ -0,0 +1,49 @@ +//===------------ udivmodhi4.S - uint16 div & mod -------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// As described at +// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the +// prototype is `struct {uint16, uint16} __udivmodhi4(uint16, uint16)`. +// The uint16 quotient is returned via R23:R22, and the uint16 remainder is +// returned via R25:R24, while R21/R26/R27 are clobbered. +// +//===----------------------------------------------------------------------===// + + .text + .align 2 + + .globl __udivmodhi4 + .type __udivmodhi4, @function + +__udivmodhi4: + sub r26, r26 + sub r27, r27 ; Initialize the remainder to zero. + ldi r21, 17 ; Only loop 16 rounds for uint16. + +__udivmodhi4_loop: + adc r24, r24 + adc r25, r25 + dec r21 + breq __udivmodhi4_end + adc r26, r26 + adc r27, r27 + cp r26, r22 + cpc r27, r23 ; Compare with the divisor. + brcs __udivmodhi4_loop + sub r26, r22 + sbc r27, r23 ; Subtract the divisor. + rjmp __udivmodhi4_loop + +__udivmodhi4_end: + com r24 + com r25 + mov r22, r24 + mov r23, r25 ; The quotient is returned in R23:R22. + mov r24, r26 + mov r25, r27 ; The remainder is returned in in R25:R24. + ret Index: compiler-rt/lib/builtins/avr/udivmodqi4.S =================================================================== --- /dev/null +++ compiler-rt/lib/builtins/avr/udivmodqi4.S @@ -0,0 +1,39 @@ +//===------------ udivmodqi4.S - uint8 div & mod --------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// As described at +// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the +// prototype is `struct {uint8, uint8} __udivmodqi4(uint8, uint8)`. +// The uint8 quotient is returned via R24, and the uint8 remainder is returned +// via R25, while R23 is clobbered. +// +//===----------------------------------------------------------------------===// + + .text + .align 2 + + .globl __udivmodqi4 + .type __udivmodqi4, @function + +__udivmodqi4: + sub r25, r25 ; Initialize the remainder to zero. + ldi r23, 9 ; Only loop 8 rounds for uint8. + +__udivmodqi4_loop: + adc r24, r24 + dec r23 + breq __udivmodqi4_end + adc r25, r25 + cp r25, r22 ; Compare with the divisor. + brcs __udivmodqi4_loop + sub r25, r22 ; Subtract the divisor. + rjmp __udivmodqi4_loop + +__udivmodqi4_end: + com r24 ; The uint8 quotient is returned via R24. + ret ; The uint8 remainder is returned via R25.