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Shenghou Ma authored
When emulating ARM FSQRT instruction, the sqrt function itself should not use any floating point arithmetics, otherwise it will clobber the user software FP registers. Fortunately, the sqrt function only uses floating point instructions to test for corner cases, so it's easy to make that function does all it job using pure integer arithmetic only. I've verified that after this change, runtime.stepflt and runtime.sqrt doesn't contain any call to _sfloat. (Perhaps we should add //go:nosfloat to make the compiler enforce this?) Fixes #10641. Change-Id: Ida4742c49000fae4fea4649f28afde630ce4c576 Signed-off-by:
Shenghou Ma <minux@golang.org> Reviewed-on: https://go-review.googlesource.com/9570Reviewed-by:
Dave Cheney <dave@cheney.net> Reviewed-by:
Keith Randall <khr@golang.org>
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