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https://github.com/Telecominfraproject/OpenCellular.git
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2650ff3d70
Add CONFIG_LTO to use GCC Link-Time Optimizations to try to reduce the flash footprint of the firmware. Add additional protection to some functions/data to avoid removal by the linker when their usage is not obvious. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=none TEST=make buildall (with and without LTO enable on all boards) Change-Id: I586b8c1eda4592b416c85383b65153c1d5ab0059 Reviewed-on: https://chromium-review.googlesource.com/271291 Trybot-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
45 lines
737 B
C
45 lines
737 B
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Software emulation for CLZ instruction
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*/
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#include "common.h"
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/**
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* Count leading zeros
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*
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* @param x non null integer.
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* @return the number of leading 0-bits in x,
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* starting at the most significant bit position.
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*/
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int __keep __clzsi2(int x)
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{
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int r = 0;
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if (!x)
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return 32;
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if (!(x & 0xffff0000u)) {
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x <<= 16;
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r += 16;
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}
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if (!(x & 0xff000000u)) {
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x <<= 8;
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r += 8;
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}
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if (!(x & 0xf0000000u)) {
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x <<= 4;
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r += 4;
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}
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if (!(x & 0xc0000000u)) {
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x <<= 2;
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r += 2;
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}
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if (!(x & 0x80000000u)) {
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x <<= 1;
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r += 1;
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}
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return r;
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}
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