2015-08-21 08:25:37 +08:00
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//===-- aeabi_cdcmp.S - EABI cdcmp* implementation ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
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#error big endian support not implemented
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#endif
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#define APSR_Z (1 << 30)
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#define APSR_C (1 << 29)
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// void __aeabi_cdcmpeq(double a, double b) {
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// if (isnan(a) || isnan(b)) {
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// Z = 0; C = 1;
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// } else {
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// __aeabi_cdcmple(a, b);
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// }
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// }
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.syntax unified
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmpeq)
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push {r0-r3, lr}
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bl __aeabi_cdcmpeq_check_nan
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cmp r0, #1
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pop {r0-r3, lr}
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// NaN has been ruled out, so __aeabi_cdcmple can't trap
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bne __aeabi_cdcmple
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msr CPSR_f, #APSR_C
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JMP(lr)
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END_COMPILERRT_FUNCTION(__aeabi_cdcmpeq)
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// void __aeabi_cdcmple(double a, double b) {
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// if (__aeabi_dcmplt(a, b)) {
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// Z = 0; C = 0;
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// } else if (__aeabi_dcmpeq(a, b)) {
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// Z = 1; C = 1;
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// } else {
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// Z = 0; C = 1;
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// }
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// }
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.syntax unified
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmple)
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// Per the RTABI, this function must preserve r0-r11.
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// Save lr in the same instruction for compactness
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push {r0-r3, lr}
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bl __aeabi_dcmplt
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cmp r0, #1
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moveq ip, #0
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beq 1f
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ldm sp, {r0-r3}
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bl __aeabi_dcmpeq
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cmp r0, #1
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moveq ip, #(APSR_C | APSR_Z)
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movne ip, #(APSR_C)
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1:
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msr CPSR_f, ip
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pop {r0-r3}
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POP_PC()
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END_COMPILERRT_FUNCTION(__aeabi_cdcmple)
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// int __aeabi_cdrcmple(double a, double b) {
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// return __aeabi_cdcmple(b, a);
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// }
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.syntax unified
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__aeabi_cdrcmple)
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// Swap r0 and r2
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mov ip, r0
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mov r0, r2
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mov r2, ip
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// Swap r1 and r3
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mov ip, r1
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mov r1, r3
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mov r3, ip
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b __aeabi_cdcmple
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END_COMPILERRT_FUNCTION(__aeabi_cdrcmple)
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2016-06-23 06:09:42 +08:00
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NO_EXEC_STACK_DIRECTIVE
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