diff options
| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
| commit | e5fd91f1ef340da553f7a79da9540c3db711c937 (patch) | |
| tree | b11842027dc6641da63f4bcc524f8678263304a3 /arch/h8300/lib/modsi3.S | |
| parent | 2a9b0348e685a63d97486f6749622b61e9e3292f (diff) | |
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/h8300/lib/modsi3.S')
| -rw-r--r-- | arch/h8300/lib/modsi3.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/h8300/lib/modsi3.S b/arch/h8300/lib/modsi3.S new file mode 100644 index 000000000..68b1dfc32 --- /dev/null +++ b/arch/h8300/lib/modsi3.S @@ -0,0 +1,72 @@ +#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 |