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.text
.balign 4
.global vec_strcmp
# int vec_strcmp(const char *src1, const char* src2)
vec_strcmp:
## Using LMUL=2, but same register names work for larger LMULs
li t1, 0 # Initial pointer bump
loop:
vsetvli t0, x0, e8, m2, ta, ma # Max length vectors of bytes
add a0, a0, t1 # Bump src1 pointer
vle8ff.v v8, (a0) # Get src1 bytes
add a1, a1, t1 # Bump src2 pointer
vle8ff.v v16, (a1) # Get src2 bytes
vmseq.vi v0, v8, 0 # Flag zero bytes in src1
vmsne.vv v1, v8, v16 # Flag if src1 != src2
vmor.mm v0, v0, v1 # Combine exit conditions
vfirst.m a2, v0 # ==0 or != ?
csrr t1, vl # Get number of bytes fetched
bltz a2, loop # Loop if all same and no zero byte
add a0, a0, a2 # Get src1 element address
lbu a3, (a0) # Get src1 byte from memory
add a1, a1, a2 # Get src2 element address
lbu a4, (a1) # Get src2 byte from memory
sub a0, a3, a4 # Return value.
ret
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