| Douglas Leung | 200f040 | 2016-02-25 20:05:47 -0800 | [diff] [blame] | 1 | %default { "naninst":"li rTEMP, -1" } |
| 2 | /* |
| 3 | * Compare two floating-point values. Puts 0, 1, or -1 into the |
| 4 | * destination register rTEMP based on the results of the comparison. |
| 5 | * |
| 6 | * Provide a "naninst" instruction that puts 1 or -1 into rTEMP depending |
| 7 | * on what value we'd like to return when one of the operands is NaN. |
| 8 | * |
| 9 | * The operation we're implementing is: |
| 10 | * if (x == y) |
| 11 | * return 0; |
| 12 | * else if (x < y) |
| 13 | * return -1; |
| 14 | * else if (x > y) |
| 15 | * return 1; |
| 16 | * else |
| 17 | * return {-1 or 1}; // one or both operands was NaN |
| 18 | * |
| 19 | * for: cmpl-float, cmpg-float |
| 20 | */ |
| 21 | /* op vAA, vBB, vCC */ |
| 22 | |
| 23 | /* "clasic" form */ |
| 24 | FETCH(a0, 1) # a0 <- CCBB |
| 25 | and a2, a0, 255 # a2 <- BB |
| 26 | srl a3, a0, 8 |
| 27 | GET_VREG_F(ft0, a2) |
| 28 | GET_VREG_F(ft1, a3) |
| 29 | #ifdef MIPS32REVGE6 |
| Alexey Frunze | 28d06c1 | 2016-10-20 21:50:05 -0700 | [diff] [blame] | 30 | cmp.lt.s ft2, ft0, ft1 # Is ft0 < ft1 |
| Douglas Leung | 200f040 | 2016-02-25 20:05:47 -0800 | [diff] [blame] | 31 | li rTEMP, -1 |
| 32 | bc1nez ft2, .L${opcode}_finish |
| Alexey Frunze | 28d06c1 | 2016-10-20 21:50:05 -0700 | [diff] [blame] | 33 | cmp.lt.s ft2, ft1, ft0 |
| Douglas Leung | 200f040 | 2016-02-25 20:05:47 -0800 | [diff] [blame] | 34 | li rTEMP, 1 |
| 35 | bc1nez ft2, .L${opcode}_finish |
| 36 | cmp.eq.s ft2, ft0, ft1 |
| 37 | li rTEMP, 0 |
| 38 | bc1nez ft2, .L${opcode}_finish |
| 39 | b .L${opcode}_nan |
| 40 | #else |
| 41 | c.olt.s fcc0, ft0, ft1 # Is ft0 < ft1 |
| 42 | li rTEMP, -1 |
| 43 | bc1t fcc0, .L${opcode}_finish |
| 44 | c.olt.s fcc0, ft1, ft0 |
| 45 | li rTEMP, 1 |
| 46 | bc1t fcc0, .L${opcode}_finish |
| 47 | c.eq.s fcc0, ft0, ft1 |
| 48 | li rTEMP, 0 |
| 49 | bc1t fcc0, .L${opcode}_finish |
| 50 | b .L${opcode}_nan |
| 51 | #endif |
| 52 | %break |
| 53 | |
| 54 | .L${opcode}_nan: |
| 55 | $naninst |
| 56 | |
| 57 | .L${opcode}_finish: |
| 58 | GET_OPA(rOBJ) |
| 59 | FETCH_ADVANCE_INST(2) # advance rPC, load rINST |
| 60 | GET_INST_OPCODE(t0) # extract opcode from rINST |
| 61 | SET_VREG_GOTO(rTEMP, rOBJ, t0) # vAA <- rTEMP |