derek.holloway
7502bf64a4
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57 lines
1.8 KiB
ArmAsm
57 lines
1.8 KiB
ArmAsm
//===-- unordsf2.S - single-precision floating point comparison -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Return 1 if the result of comparing x with y is 'unordered', i.e.
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// one of x and y is NaN.
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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.syntax unified
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.text
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.p2align 2
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#if __ARM_PCS_VFP
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DEFINE_COMPILERRT_FUNCTION(__unordsf2)
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push {r4, lr}
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vmov r0, s0
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vmov r1, s1
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bl __aeabi_fcmpun
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pop {r4, pc}
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#else
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DEFINE_COMPILERRT_FUNCTION_ALIAS(__unordsf2, __aeabi_fcmpun)
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#endif
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DEFINE_COMPILERRT_FUNCTION(__aeabi_fcmpun)
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// This function isn't based on the general-purpose code in fcmp.h, because
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// it's more effort than needed. Here we just need to identify whether or not
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// there's at least one NaN in the inputs. There's no need to vary that check
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// based on the sign bit, so we might as well just do the NaN test as quickly
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// as possible.
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mov r12, #0xFF << 24
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cmp r12, r0, lsl #1 // if LO, then r12 < (r0 << 1), so r0 is a NaN
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cmphs r12, r1, lsl #1 // if not LO, then do the same check for r1
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// If HS, then we have no NaNs and return false. We do this as quickly as we
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// can (not stopping to take two instructions setting up r0 for both
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// possibilities), on the assumption that NaNs are rare and we want to
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// optimize for the non-NaN path.
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movhs r0, #0
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bxhs lr
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// Otherwise, we have at least one NaN, and return true.
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mov r0, #1
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bx lr
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END_COMPILERRT_FUNCTION(__aeabi_fcmpun)
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NO_EXEC_STACK_DIRECTIVE
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