0b5d7b6e2e
The RVCT compiler may emit calls to the various __aeabi_c?cmp??
functions, which return their results via the CPU condition flags
C and Z. According to ARM doc IHI 0043D 'Run-time ABI for the ARM
architecture':
The 3-way comparison functions c*cmple, c*cmpeq and c*rcmple return
their results in the CPSR Z and C flags. C is clear only if the operands
are ordered and the first operand is less than the second. Z is set only
when the operands are ordered and equal.
Add implementations for the double and float variants of the above.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19327 6f19259b-4bc3-4df7-8a09-765794883524
48 lines
1.5 KiB
NASM
48 lines
1.5 KiB
NASM
//------------------------------------------------------------------------------
|
|
//
|
|
// Copyright (c) 2015, Linaro Limited. All rights reserved.
|
|
//
|
|
// This program and the accompanying materials
|
|
// are licensed and made available under the terms and conditions of the BSD License
|
|
// which accompanies this distribution. The full text of the license may be found at
|
|
// http://opensource.org/licenses/bsd-license.php
|
|
//
|
|
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
//
|
|
//------------------------------------------------------------------------------
|
|
|
|
EXPORT __aeabi_cdrcmple
|
|
EXPORT __aeabi_cdcmpeq
|
|
EXPORT __aeabi_cdcmple
|
|
IMPORT _softfloat_float64_eq
|
|
IMPORT _softfloat_float64_lt
|
|
|
|
AREA __aeabi_cdcmp, CODE, READONLY
|
|
PRESERVE8
|
|
|
|
__aeabi_cdrcmple
|
|
MOV IP, R0
|
|
MOV R0, R2
|
|
MOV R2, IP
|
|
|
|
MOV IP, R1
|
|
MOV R1, R3
|
|
MOV R3, IP
|
|
|
|
__aeabi_cdcmpeq
|
|
__aeabi_cdcmple
|
|
PUSH {R0 - R3, IP, LR}
|
|
BL _softfloat_float64_eq
|
|
SUB IP, R0, #1
|
|
CMP IP, #0 // sets C and Z if R0 == 1
|
|
POPEQ {R0 - R3, IP, PC}
|
|
|
|
LDM SP, {R0 - R3}
|
|
BL _softfloat_float64_lt
|
|
SUB IP, R0, #1
|
|
CMP IP, #1 // sets C if R0 == 0
|
|
POP {R0 - R3, IP, PC}
|
|
|
|
END
|