diff options
Diffstat (limited to 'runtime/arm/i64_stof.S')
| -rw-r--r-- | runtime/arm/i64_stof.S | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/runtime/arm/i64_stof.S b/runtime/arm/i64_stof.S index bb5e05c0..d8a250c8 100644 --- a/runtime/arm/i64_stof.S +++ b/runtime/arm/i64_stof.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 @@ -37,11 +37,11 @@ #include "sysdeps.h" @@@ Conversion from signed 64-bit integer to single float - + FUNCTION(__i64_stof) @ Check whether -2^53 <= X < 2^53 - ASR r2, r1, #21 - ASR r3, r1, #31 @ (r2,r3) = X >> 53 + ASR r2, Reg0HI, #21 + ASR r3, Reg0HI, #31 @ (r2,r3) = X >> 53 adds r2, r2, #1 adc r3, r3, #0 @ (r2,r3) = X >> 53 + 1 cmp r3, #2 @@ -49,29 +49,29 @@ FUNCTION(__i64_stof) @ X is large enough that double rounding can occur. @ Avoid it by nudging X away from the points where double rounding @ occurs (the "round to odd" technique) - MOV r2, #0x700 + MOV r2, #0x700 ORR r2, r2, #0xFF @ r2 = 0x7FF - AND r3, r0, r2 @ extract bits 0 to 11 of X + AND r3, Reg0LO, r2 @ extract bits 0 to 11 of X ADD r3, r3, r2 @ r3 = (X & 0x7FF) + 0x7FF @ bit 12 of r3 is 0 if all low 12 bits of X are 0, 1 otherwise @ bits 13-31 of r3 are 0 - ORR r0, r0, r3 @ correct bit number 12 of X - BIC r0, r0, r2 @ set to 0 bits 0 to 11 of X + ORR Reg0LO, Reg0LO, r3 @ correct bit number 12 of X + BIC Reg0LO, Reg0LO, r2 @ set to 0 bits 0 to 11 of X @ Convert to double -1: vmov s0, r0 +1: vmov s0, Reg0LO vcvt.f64.u32 d0, s0 @ convert low half to double (unsigned) - vmov s2, r1 + vmov s2, Reg0HI vcvt.f64.s32 d1, s2 @ convert high half to double (signed) vldr d2, .LC1 @ d2 = 2^32 vmla.f64 d0, d1, d2 @ d0 = d0 + d1 * d2 = double value of int64 @ Round to single vcvt.f32.f64 s0, d0 -#ifdef ABI_eabi +#ifdef ABI_eabi @ Return result in r0 - vmov r0, s0 -#endif + vmov r0, s0 +#endif bx lr ENDFUNCTION(__i64_stof) - + .balign 8 .LC1: .quad 0x41f0000000000000 @ 2^32 in double precision |