derek.holloway
7502bf64a4
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61 lines
2.3 KiB
ArmAsm
61 lines
2.3 KiB
ArmAsm
//===-- unorddf2.S - double-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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#include "../crt_endian.h"
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.syntax unified
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.text
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION_ALIAS(__unorddf2, __aeabi_dcmpun)
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DEFINE_COMPILERRT_THUMB_FUNCTION(__aeabi_dcmpun)
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// This function isn't based on the general-purpose code in dcmp.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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//
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// We do this by shifting the high word of each input left to get rid of the
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// sign bit, shifting a bit in at the bottom which is 1 if any bit is set in
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// the low word. Then we check if the result is _greater_ than 0xFFE00000
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// (but not equal), via adding 0x00200000 to it and testing for the HI
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// condition (carry flag set, but Z clear).
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//
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// Once we've done that transformation to the first input xh:xl, we
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// free up xl to contain our constant 0x00200000, so there's no need
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// to push any registers.
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cmp xl, #1 // set C if xl is nonzero
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adcs xh, xh, xh // shift xh left, bringing in the C bit
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movs xl, #1 // now xl is free, make the test constant
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lsls xl, xl, #21 // by shifting 1 left to make 0x00200000
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cmn xh, xl // HI if x is a NaN
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bhi LOCAL_LABEL(NaN)
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cmp yl, #1 // set C if yl is nonzero
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adcs yh, yh, yh // shift yh left, bringing in the C bit
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cmn yh, xl // HI if y is a NaN
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bhi LOCAL_LABEL(NaN)
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movs r0, #0
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bx lr
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LOCAL_LABEL(NaN):
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movs r0, #1
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bx lr
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END_COMPILERRT_FUNCTION(__aeabi_dcmpun)
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NO_EXEC_STACK_DIRECTIVE
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