1//===-- aeabi_cfcmp.S - EABI cfcmp* implementation ------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#include "../assembly.h" 10 11#define APSR_Z (1 << 30) 12#define APSR_C (1 << 29) 13 14// void __aeabi_cfcmpeq(float a, float b) { 15// if (isnan(a) || isnan(b)) { 16// Z = 0; C = 1; 17// } else { 18// __aeabi_cfcmple(a, b); 19// } 20// } 21 22 .syntax unified 23 .p2align 2 24DEFINE_COMPILERRT_FUNCTION(__aeabi_cfcmpeq) 25 push {r0-r3, lr} 26 bl __aeabi_cfcmpeq_check_nan 27 cmp r0, #1 28#if defined(USE_THUMB_1) 29 beq 1f 30 // NaN has been ruled out, so __aeabi_cfcmple can't trap 31 mov r0, sp 32 ldm r0, {r0-r3} 33 bl __aeabi_cfcmple 34 pop {r0-r3, pc} 351: 36 // Z = 0, C = 1 37 movs r0, #0xF 38 lsls r0, r0, #31 39 pop {r0-r3, pc} 40#else 41 pop {r0-r3, lr} 42 43 // NaN has been ruled out, so __aeabi_cfcmple can't trap 44 // Use "it ne" + unconditional branch to guarantee a supported relocation if 45 // __aeabi_cfcmple is in a different section for some builds. 46 IT(ne) 47 bne __aeabi_cfcmple 48 49#if defined(USE_THUMB_2) 50 mov ip, #APSR_C 51 msr APSR_nzcvq, ip 52#else 53 msr APSR_nzcvq, #APSR_C 54#endif 55 JMP(lr) 56#endif 57END_COMPILERRT_FUNCTION(__aeabi_cfcmpeq) 58 59 60// void __aeabi_cfcmple(float a, float b) { 61// if (__aeabi_fcmplt(a, b)) { 62// Z = 0; C = 0; 63// } else if (__aeabi_fcmpeq(a, b)) { 64// Z = 1; C = 1; 65// } else { 66// Z = 0; C = 1; 67// } 68// } 69 70 .syntax unified 71 .p2align 2 72DEFINE_COMPILERRT_FUNCTION(__aeabi_cfcmple) 73 // Per the RTABI, this function must preserve r0-r11. 74 // Save lr in the same instruction for compactness 75 push {r0-r3, lr} 76 77 bl __aeabi_fcmplt 78 cmp r0, #1 79#if defined(USE_THUMB_1) 80 bne 1f 81 // Z = 0, C = 0 82 movs r0, #1 83 lsls r0, r0, #1 84 pop {r0-r3, pc} 851: 86 mov r0, sp 87 ldm r0, {r0-r3} 88 bl __aeabi_fcmpeq 89 cmp r0, #1 90 bne 2f 91 // Z = 1, C = 1 92 movs r0, #2 93 lsls r0, r0, #31 94 pop {r0-r3, pc} 952: 96 // Z = 0, C = 1 97 movs r0, #0xF 98 lsls r0, r0, #31 99 pop {r0-r3, pc} 100#else 101 ITT(eq) 102 moveq ip, #0 103 beq 1f 104 105 ldm sp, {r0-r3} 106 bl __aeabi_fcmpeq 107 cmp r0, #1 108 ITE(eq) 109 moveq ip, #(APSR_C | APSR_Z) 110 movne ip, #(APSR_C) 111 1121: 113 msr APSR_nzcvq, ip 114 pop {r0-r3} 115 POP_PC() 116#endif 117END_COMPILERRT_FUNCTION(__aeabi_cfcmple) 118 119// int __aeabi_cfrcmple(float a, float b) { 120// return __aeabi_cfcmple(b, a); 121// } 122 123 .syntax unified 124 .p2align 2 125DEFINE_COMPILERRT_FUNCTION(__aeabi_cfrcmple) 126 // Swap r0 and r1 127 mov ip, r0 128 mov r0, r1 129 mov r1, ip 130 131 b __aeabi_cfcmple 132END_COMPILERRT_FUNCTION(__aeabi_cfrcmple) 133 134NO_EXEC_STACK_DIRECTIVE 135 136