diff options
Diffstat (limited to 'runtime/powerpc/i64_sdiv.s')
| -rw-r--r-- | runtime/powerpc/i64_sdiv.s | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/runtime/powerpc/i64_sdiv.s b/runtime/powerpc/i64_sdiv.s index f522506..411ad50 100644 --- a/runtime/powerpc/i64_sdiv.s +++ b/runtime/powerpc/i64_sdiv.s @@ -41,8 +41,10 @@ .balign 16 .globl __i64_sdiv __i64_sdiv: - mflr r11 # save return address - xor r12, r3, r5 # save sign of result in r12 (top bit) + mflr r0 + stw r0, 4(r1) # save return address in caller's frame + xor r0, r3, r5 # compute sign of result (top bit) + mtctr r0 # save it in CTR (why not?) srawi r0, r3, 31 # take absolute value of N xor r4, r4, r0 # (i.e. N = N ^ r0 - r0, xor r3, r3, r0 # where r0 = 0 if N >= 0 and r0 = -1 if N < 0) @@ -54,12 +56,14 @@ __i64_sdiv: subfc r6, r0, r6 subfe r5, r0, r5 bl __i64_udivmod # do unsigned division - mtlr r11 # restore return address - srawi r0, r12, 31 # apply expected sign to quotient - xor r8, r8, r0 # RES = Q if r12 >= 0, -Q if r12 < 0 - xor r7, r7, r0 - subfc r4, r0, r8 - subfe r3, r0, r7 + lwz r0, 4(r1) + mtlr r0 # restore return address + mfctr r0 + srawi r0, r0, 31 # apply expected sign to quotient + xor r6, r6, r0 # RES = Q if CTR >= 0, -Q if CTR < 0 + xor r5, r5, r0 + subfc r4, r0, r6 + subfe r3, r0, r5 blr .type __i64_sdiv, @function .size __i64_sdiv, .-__i64_sdiv |