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90167c1764
Cortex-M4 supports a floating point square root function that takes 14 cycles to execute, which is a speed improvement over the existing binary search, and saves flash space. BUG=chromium:687624 BRANCH=None TEST=On kevin, verify that both sqrtf methods (binary search vs HW instruction) have identical results for fractional input (eg. sqrt(15.999999) = 3), except when floating point representation of square root rounds up to an integer. Verify identical results for all integers [-100, 16793602). Note that 16793602 is the first integer for which the floating point representation of sqrt rounds up to an integer. Also verify basic motion sense functions on kevin. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I8521c9a28c958b340ca83c37342253e424df0c91 Reviewed-on: https://chromium-review.googlesource.com/537734 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
12 lines
297 B
C
12 lines
297 B
C
/* Copyright 2017 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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/* Math utility functions for ARMv6-M */
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#ifndef __CROS_EC_MATH_H
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#define __CROS_EC_MATH_H
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#endif /* __CROS_EC_MATH_H */
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