diff options
Diffstat (limited to 'runtime/powerpc/i64_dtos.s')
| -rw-r--r-- | runtime/powerpc/i64_dtos.s | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/runtime/powerpc/i64_dtos.s b/runtime/powerpc/i64_dtos.s index 56c6e4b..9b1288f 100644 --- a/runtime/powerpc/i64_dtos.s +++ b/runtime/powerpc/i64_dtos.s @@ -58,16 +58,27 @@ __i64_dtos: rlwinm r3, r3, 0, 12, 31 # HI &= ~0xFFF00000 oris r3, r3, 0x10 # HI |= 0x00100000 # shift it appropriately - mflr r9 # save retaddr in r9 cmpwi r5, 0 blt 3f - bl __i64_shl # if EXP >= 0, shift left by EXP + # if EXP >= 0, shift left by EXP. Note that EXP < 11. + subfic r6, r5, 32 # r6 = 32 - EXP + slw r3, r3, r5 + srw r0, r4, r6 + or r3, r3, r0 + slw r4, r4, r5 b 4f -3: subfic r5, r5, 0 - bl __i64_shr # if EXP < 0, shift right by -EXP + # if EXP < 0, shift right by -EXP. Note that -EXP <= 52 but can be >= 32. +3: subfic r5, r5, 0 # r5 = -EXP = shift amount + subfic r6, r5, 32 # r6 = 32 - amount + addi r7, r5, -32 # r7 = amount - 32 (see i64_shr.s) + srw r4, r4, r5 + slw r0, r3, r6 + or r4, r4, r0 + srw r0, r3, r7 + or r4, r4, r0 + srw r3, r3, r5 # apply sign to result -4: mtlr r9 - xor r4, r4, r10 +4: xor r4, r4, r10 xor r3, r3, r10 subfc r4, r10, r4 subfe r3, r10, r3 @@ -76,7 +87,7 @@ __i64_dtos: 1: li r3, 0 # result is 0 li r4, 0 blr -2: cmpwi r10, 0 # result is MAX_SINT or MIN_SINT +2: li r4, -1 # result is MAX_SINT or MIN_SINT bge 5f # depending on sign li r4, -1 # result is MAX_SINT = 0x7FFF_FFFF srwi r3, r4, 1 |