| buzbee | 1452bee | 2015-03-06 14:43:04 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Compare two floating-point values. Puts 0, 1, or -1 into the |
| 3 | * destination register based on the results of the comparison. |
| 4 | * |
| 5 | * int compare(x, y) { |
| 6 | * if (x == y) { |
| 7 | * return 0; |
| 8 | * } else if (x < y) { |
| 9 | * return -1; |
| 10 | * } else if (x > y) { |
| 11 | * return 1; |
| 12 | * } else { |
| 13 | * return 1; |
| 14 | * } |
| 15 | * } |
| 16 | */ |
| 17 | /* op vAA, vBB, vCC */ |
| 18 | FETCH r0, 1 @ r0<- CCBB |
| 19 | mov r9, rINST, lsr #8 @ r9<- AA |
| 20 | and r2, r0, #255 @ r2<- BB |
| 21 | mov r3, r0, lsr #8 @ r3<- CC |
| 22 | VREG_INDEX_TO_ADDR r2, r2 @ r2<- &vBB |
| 23 | VREG_INDEX_TO_ADDR r3, r3 @ r3<- &vCC |
| 24 | fldd d0, [r2] @ d0<- vBB |
| 25 | fldd d1, [r3] @ d1<- vCC |
| 26 | fcmped d0, d1 @ compare (vBB, vCC) |
| 27 | FETCH_ADVANCE_INST 2 @ advance rPC, load rINST |
| 28 | mov r0, #1 @ r0<- 1 (default) |
| 29 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 30 | fmstat @ export status flags |
| 31 | mvnmi r0, #0 @ (less than) r1<- -1 |
| 32 | moveq r0, #0 @ (equal) r1<- 0 |
| 33 | SET_VREG r0, r9 @ vAA<- r0 |
| 34 | GOTO_OPCODE ip @ jump to next instruction |