| Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 1 | //===-- aeabi_cdcmp.S - EABI cdcmp* implementation ------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "../assembly.h" |
| 11 | |
| 12 | #if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__ |
| 13 | #error big endian support not implemented |
| 14 | #endif |
| 15 | |
| 16 | #define APSR_Z (1 << 30) |
| 17 | #define APSR_C (1 << 29) |
| 18 | |
| 19 | // void __aeabi_cdcmpeq(double a, double b) { |
| 20 | // if (isnan(a) || isnan(b)) { |
| 21 | // Z = 0; C = 1; |
| 22 | // } else { |
| 23 | // __aeabi_cdcmple(a, b); |
| 24 | // } |
| 25 | // } |
| 26 | |
| 27 | .syntax unified |
| 28 | .p2align 2 |
| 29 | DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmpeq) |
| 30 | push {r0-r3, lr} |
| 31 | bl __aeabi_cdcmpeq_check_nan |
| 32 | cmp r0, #1 |
| 33 | pop {r0-r3, lr} |
| 34 | |
| 35 | // NaN has been ruled out, so __aeabi_cdcmple can't trap |
| 36 | bne __aeabi_cdcmple |
| 37 | |
| 38 | msr CPSR_f, #APSR_C |
| 39 | JMP(lr) |
| 40 | END_COMPILERRT_FUNCTION(__aeabi_cdcmpeq) |
| 41 | |
| 42 | |
| 43 | // void __aeabi_cdcmple(double a, double b) { |
| 44 | // if (__aeabi_dcmplt(a, b)) { |
| 45 | // Z = 0; C = 0; |
| 46 | // } else if (__aeabi_dcmpeq(a, b)) { |
| 47 | // Z = 1; C = 1; |
| 48 | // } else { |
| 49 | // Z = 0; C = 1; |
| 50 | // } |
| 51 | // } |
| 52 | |
| 53 | .syntax unified |
| 54 | .p2align 2 |
| 55 | DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmple) |
| 56 | // Per the RTABI, this function must preserve r0-r11. |
| 57 | // Save lr in the same instruction for compactness |
| 58 | push {r0-r3, lr} |
| 59 | |
| 60 | bl __aeabi_dcmplt |
| 61 | cmp r0, #1 |
| 62 | moveq ip, #0 |
| 63 | beq 1f |
| 64 | |
| 65 | ldm sp, {r0-r3} |
| 66 | bl __aeabi_dcmpeq |
| 67 | cmp r0, #1 |
| 68 | moveq ip, #(APSR_C | APSR_Z) |
| 69 | movne ip, #(APSR_C) |
| 70 | |
| 71 | 1: |
| 72 | msr CPSR_f, ip |
| 73 | pop {r0-r3} |
| 74 | POP_PC() |
| 75 | END_COMPILERRT_FUNCTION(__aeabi_cdcmple) |
| 76 | |
| 77 | // int __aeabi_cdrcmple(double a, double b) { |
| 78 | // return __aeabi_cdcmple(b, a); |
| 79 | // } |
| 80 | |
| 81 | .syntax unified |
| 82 | .p2align 2 |
| 83 | DEFINE_COMPILERRT_FUNCTION(__aeabi_cdrcmple) |
| 84 | // Swap r0 and r2 |
| 85 | mov ip, r0 |
| 86 | mov r0, r2 |
| 87 | mov r2, ip |
| 88 | |
| 89 | // Swap r1 and r3 |
| 90 | mov ip, r1 |
| 91 | mov r1, r3 |
| 92 | mov r3, ip |
| 93 | |
| 94 | b __aeabi_cdcmple |
| 95 | END_COMPILERRT_FUNCTION(__aeabi_cdrcmple) |
| 96 | |