diff options
Diffstat (limited to 'runtime/arm/i64_dtou.S')
| -rw-r--r-- | runtime/arm/i64_dtou.S | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/runtime/arm/i64_dtou.S b/runtime/arm/i64_dtou.S index 57641909..6e47f3de 100644 --- a/runtime/arm/i64_dtou.S +++ b/runtime/arm/i64_dtou.S @@ -17,7 +17,7 @@ @ * Neither the name of the <organization> nor the @ names of its contributors may be used to endorse or promote products @ derived from this software without specific prior written permission. -@ +@ @ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS @ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT @ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR @@ -36,18 +36,18 @@ #include "sysdeps.h" -@@@ Conversion from double float to unsigned 64-bit integer +@@@ Conversion from double float to unsigned 64-bit integer FUNCTION(__i64_dtou) #ifndef ABI_eabi - vmov r0, r1, d0 -#endif - cmp r1, #0 @ is double < 0 ? + vmov Reg0LO, Reg0HI, d0 +#endif + cmp Reg0HI, #0 @ is double < 0 ? blt 1f @ then it converts to 0 @ extract unbiased exponent ((HI & 0x7FF00000) >> 20) - (1023 + 52) in r2 @ note: 1023 + 52 = 1075 = 1024 + 51 @ note: (HI & 0x7FF00000) >> 20 = (HI << 1) >> 21 - LSL r2, r1, #1 + LSL r2, Reg0HI, #1 LSR r2, r2, #21 SUB r2, r2, #51 SUB r2, r2, #1024 @@ -57,35 +57,35 @@ FUNCTION(__i64_dtou) cmp r2, #12 @ if EXP >= 64 - 52, double is >= 2^64 bge 2f @ extract true mantissa - BIC r1, r1, #0xFF000000 - BIC r1, r1, #0x00F00000 @ HI &= ~0xFFF00000 - ORR r1, r1, #0x00100000 @ HI |= 0x00100000 + BIC Reg0HI, Reg0HI, #0xFF000000 + BIC Reg0HI, Reg0HI, #0x00F00000 @ HI &= ~0xFFF00000 + ORR Reg0HI, Reg0HI, #0x00100000 @ HI |= 0x00100000 @ shift it appropriately cmp r2, #0 blt 3f - @ EXP >= 0: shift left by EXP. Note that EXP < 12 + @ EXP >= 0: shift left by EXP. Note that EXP < 12 rsb r3, r2, #32 @ r3 = 32 - amount - LSL r1, r1, r2 - LSR r3, r0, r3 - ORR r1, r1, r3 - LSL r0, r0, r2 + LSL Reg0HI, Reg0HI, r2 + LSR r3, Reg0LO, r3 + ORR Reg0HI, Reg0HI, r3 + LSL Reg0LO, Reg0LO, r2 bx lr - @ EXP < 0: shift right by -EXP. Note that -EXP <= 52 but can be >= 32 + @ 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 - LSR r0, r0, r2 - LSL r3, r1, r3 - ORR r0, r0, r3 - SUB r3, r2, #32 @ r3 = amount - 32 (see i64_shr.s) - LSR r3, r1, r3 - ORR r0, r0, r3 - LSR r1, r1, r2 + LSR Reg0LO, Reg0LO, r2 + LSL r3, Reg0HI, r3 + ORR Reg0LO, Reg0LO, r3 + SUB r3, r2, #32 @ r3 = amount - 32 (see i64_shr.s) + LSR r3, Reg0HI, r3 + ORR Reg0LO, Reg0LO, r3 + LSR Reg0HI, Reg0HI, r2 bx lr @ special cases -1: MOV r0, #0 @ result is 0 - MOV r1, #0 +1: MOV Reg0LO, #0 @ result is 0 + MOV Reg0HI, #0 bx lr -2: mvn r0, #0 @ result is 0xFF....FF (MAX_UINT) - MOV r1, r0 +2: mvn Reg0LO, #0 @ result is 0xFF....FF (MAX_UINT) + MOV Reg0HI, Reg0LO bx lr ENDFUNCTION(__i64_dtou) |