sisungo
ef7d225be7
Musl uses hard-coded logic for iconv. This patch moves the logic out of C code, and implement a virtual machine for dynamically loading charsets at runtime and do conversion.
79 lines
1018 B
ArmAsm
79 lines
1018 B
ArmAsm
place64 @sicv_magic_v1
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place64 utf8_boundary, utf8_boundary
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utf8_boundary:
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input8 &r0
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load64 _0x80, &r1
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lt &r0, &r1, &r2
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eq &r2, &r255, &r2
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jnz &r2, Lmultibyte
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output8 &r0
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ret &r255
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Lmultibyte:
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load64 _0xC0, &r1
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load64 _0xFD, &r2
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lt &r0, &r1, &r1
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mt &r0, &r2, &r2
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or &r1, &r2, &r1
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eq &r1, &r255, &r1
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jnz &r1, Lvalid_multibyte
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load64 ERROR, &r1
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ret &r1
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Lvalid_multibyte:
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output8 &r0
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load64 _0xE0, &r1
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lt &r0, &r1, &r1
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eq &r1, &r255, &r1
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input8 &r3
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output8 &r3
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jnz &r1, L3b
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L2b:
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ret &r255
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L3b:
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input8 &r3
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output8 &r3
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load64 _0xF0, &r1
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lt &r0, &r1, &r1
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eq &r1, &r255, &r1
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jnz &r1, L4b
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ret &r255
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L4b:
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input8 &r3
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output8 &r3
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load64 _0xF8, &r1
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lt &r0, &r1, &r1
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eq &r1, &r255, &r1
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jnz &r1, L5b
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ret &r255
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L5b:
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input8 &r3
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output8 &r3
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load64 _0xFC, &r1
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lt &r0, &r1, &r1
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eq &r1, &r255, &r1
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jnz &r1, L6b
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ret &r255
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L6b:
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input8 &r3
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output8 &r3
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ret &r255
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ERROR:
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place64 0xffffffffffffffff
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_0x80:
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place64 0x80
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_0xC0:
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place64 0xc0
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_0xFD:
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place64 0xfd
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_0xE0:
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place64 0xe0
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_0xF0:
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place64 0xf0
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_0xF8:
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place64 0xf8
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_0xFC:
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place64 0xfc
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