diff options
Diffstat (limited to 'runtime/arm/i64_dtou.S')
| -rw-r--r-- | runtime/arm/i64_dtou.S | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/runtime/arm/i64_dtou.S b/runtime/arm/i64_dtou.S index 7f6152e..50648a5 100644 --- a/runtime/arm/i64_dtou.S +++ b/runtime/arm/i64_dtou.S @@ -60,9 +60,22 @@ __i64_dtou: orr r1, r1, #0x00100000 @ HI |= 0x00100000 @ shift it appropriately cmp r2, #0 - bge __i64_shl @ if EXP >= 0, shift left by EXP - rsb r2, r2, #0 - b __i64_shr @ otherwise, shift right by -EXP + blt 3f + @ EXP >= 0: shift left by EXP. Note that EXP < 12 + rsb r3, r2, #32 @ r3 = 32 - amount + mov r1, r1, lsl r2 + orr r1, r1, r0, lsr r3 + mov r0, r0, lsl r2 + bx lr + @ EXP < 0: shift right by -EXP. Note that -EXP <= 52 but can be >= 32 +3: rsb r2, r2, #0 @ r2 = -EXP - shift amount + rsb r3, r2, #32 @ r3 = 32 - amount + mov r0, r0, lsr r2 + orr r0, r0, r1, lsl r3 + sub r3, r2, #32 @ r3 = amount - 32 (see i64_shr.s) + orr r0, r0, r1, lsr r3 + mov r1, r1, lsr r2 + bx lr @ special cases 1: mov r0, #0 @ result is 0 mov r1, #0 |