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Diffstat (limited to 'arch/h8300/lib/modsi3.S')
| -rw-r--r-- | arch/h8300/lib/modsi3.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/h8300/lib/modsi3.S b/arch/h8300/lib/modsi3.S new file mode 100644 index 000000000..bdc8a0029 --- /dev/null +++ b/arch/h8300/lib/modsi3.S @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include "libgcc.h" + +; numerator in A0/A1 +; denominator in A2/A3 + .global __modsi3 +__modsi3: + PUSHP S2P + bsr modnorm + bsr __divsi3 + mov.l er3,er0 + bra exitdiv + + .global __umodsi3 +__umodsi3: + bsr __udivsi3 + mov.l er3,er0 + rts + + .global __divsi3 +__divsi3: + PUSHP S2P + jsr divnorm + bsr __udivsi3 + + ; examine what the sign should be +exitdiv: + btst #3,S2L + beq reti + + ; should be -ve + neg.l A0P + +reti: + POPP S2P + rts + +divnorm: + mov.l A0P,A0P ; is the numerator -ve + stc ccr,S2L ; keep the sign in bit 3 of S2L + bge postive + + neg.l A0P ; negate arg + +postive: + mov.l A1P,A1P ; is the denominator -ve + bge postive2 + + neg.l A1P ; negate arg + xor.b #0x08,S2L ; toggle the result sign + +postive2: + rts + +;; Basically the same, except that the sign of the divisor determines +;; the sign. +modnorm: + mov.l A0P,A0P ; is the numerator -ve + stc ccr,S2L ; keep the sign in bit 3 of S2L + bge mpostive + + neg.l A0P ; negate arg + +mpostive: + mov.l A1P,A1P ; is the denominator -ve + bge mpostive2 + + neg.l A1P ; negate arg + +mpostive2: + rts + + .end |