derek.holloway
7502bf64a4
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37 lines
1.1 KiB
ArmAsm
37 lines
1.1 KiB
ArmAsm
// 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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#include "../assembly.h"
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// float __floatdisf(di_int a);
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// This routine has some extra memory traffic, loading the 64-bit input via two
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// 32-bit loads, then immediately storing it back to the stack via a single 64-bit
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// store. This is to avoid a write-small, read-large stall.
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// However, if callers of this routine can be safely assumed to store the argument
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// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
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// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.
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#ifdef __i386__
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.text
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.balign 4
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DEFINE_COMPILERRT_FUNCTION(__floatdisf)
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#ifndef TRUST_CALLERS_USE_64_BIT_STORES
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movd 4(%esp), %xmm0
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movd 8(%esp), %xmm1
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punpckldq %xmm1, %xmm0
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movq %xmm0, 4(%esp)
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#endif
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fildll 4(%esp)
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fstps 4(%esp)
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flds 4(%esp)
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ret
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END_COMPILERRT_FUNCTION(__floatdisf)
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#endif // __i386__
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NO_EXEC_STACK_DIRECTIVE
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