diff options
| author | bhgv <bhgv.empire@gmail.com> | 2018-03-01 16:54:45 +0200 |
|---|---|---|
| committer | bhgv <bhgv.empire@gmail.com> | 2018-03-01 16:54:45 +0200 |
| commit | b786f20bbab5a59046aa78a2c6c2a11536497202 (patch) | |
| tree | 0851ecdec889eb9b7ba3751cc04d4f0b474e4a9e /libkern/strchr-sparc.s | |
inferno-os tree was separated from the inferno-os-android (separated from the Android driver)
Diffstat (limited to 'libkern/strchr-sparc.s')
| -rw-r--r-- | libkern/strchr-sparc.s | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libkern/strchr-sparc.s b/libkern/strchr-sparc.s new file mode 100644 index 0000000..192beab --- /dev/null +++ b/libkern/strchr-sparc.s @@ -0,0 +1,73 @@ + TEXT strchr(SB), $0 + +MOVW R7, 0(FP) + MOVB c+7(FP), R10 + MOVW s+0(FP), R9 + + SUBCC R0,R10, R0 + BE l2 + +/* + * char is not null + */ +l1: + MOVB (R9), R7 + ADD $1, R9 + SUBCC R0,R7, R0 + BE ret + SUBCC R7,R10, R0 + BNE l1 + JMP rm1 + +/* + * char is null + * align to word + */ +l2: + ANDCC $3,R9, R0 + BE l3 + MOVB (R9), R7 + ADD $1, R9 + SUBCC R0,R7, R0 + BNE l2 + JMP rm1 + +/* + * develop byte masks + */ +l3: + MOVW $0xff, R17 + SLL $8,R17, R16 + SLL $16,R17, R13 + SLL $24,R17, R12 + +l4: + MOVW (R9), R11 + ADD $4, R9 + ANDCC R12,R11, R0 + BE b0 + ANDCC R13,R11, R0 + BE b1 + ANDCC R16,R11, R0 + BE b2 + ANDCC R17,R11, R0 + BNE l4 + +rm1: + SUB $1,R9, R7 + JMP ret + +b2: + SUB $2,R9, R7 + JMP ret + +b1: + SUB $3,R9, R7 + JMP ret + +b0: + SUB $4,R9, R7 + JMP ret + +ret: + RETURN |