| Bill Buzbee | 7c58bd4 | 2016-01-20 20:46:01 +0000 | [diff] [blame] | 1 | %default {"suff":"d","nanval":"pos"} |
| 2 | /* |
| 3 | * Compare two floating-point values. Puts 0, 1, or -1 into the |
| 4 | * destination register based on the results of the comparison. |
| 5 | * |
| 6 | * int compare(x, y) { |
| 7 | * if (x == y) { |
| 8 | * return 0; |
| 9 | * } else if (x < y) { |
| 10 | * return -1; |
| 11 | * } else if (x > y) { |
| 12 | * return 1; |
| 13 | * } else { |
| 14 | * return nanval ? 1 : -1; |
| 15 | * } |
| 16 | * } |
| 17 | */ |
| 18 | /* op vAA, vBB, vCC */ |
| 19 | movzbl 3(rPC), %ecx # ecx<- CC |
| 20 | movzbl 2(rPC), %eax # eax<- BB |
| 21 | movs${suff} VREG_ADDRESS(%eax), %xmm0 |
| 22 | xor %eax, %eax |
| 23 | ucomis${suff} VREG_ADDRESS(%ecx), %xmm0 |
| 24 | jp .L${opcode}_nan_is_${nanval} |
| 25 | je .L${opcode}_finish |
| 26 | jb .L${opcode}_less |
| 27 | .L${opcode}_nan_is_pos: |
| 28 | incl %eax |
| 29 | jmp .L${opcode}_finish |
| 30 | .L${opcode}_nan_is_neg: |
| 31 | .L${opcode}_less: |
| 32 | decl %eax |
| 33 | .L${opcode}_finish: |
| Serguei Katkov | 05dfaaa | 2016-01-28 08:21:26 +0600 | [diff] [blame] | 34 | SET_VREG %eax, rINST |
| Bill Buzbee | 7c58bd4 | 2016-01-20 20:46:01 +0000 | [diff] [blame] | 35 | ADVANCE_PC_FETCH_AND_GOTO_NEXT 2 |