commit 3041cf9726e2daf183ec66a69d25bc35d4567f60
author Jens Wiklander <jens.wiklander@linaro.org> Mon May 27 16:42:58 2019 +0200
committer Jérôme Forissier <jerome@forissier.org> Mon Aug 02 10:48:41 2021 +0200
tree a7737c573b1422bd7114495c0b8517a5c6d5ca66
parent a2e7a4cd262da33e22fcf07bf6e42c66cfee47e2

libmbedtls: mbedtls_mpi_exp_mod(): optimize mempool usage

With W allocated in the mempool instead of the stack it is more important
to utilize the mempool in a stack like way.

With this patch allocation and initialization of W is moved to a point
where all following mempool allocations are free before the function
returns.

This reduces maximum memory consumption of mempool in regression case
8101 for an AArch64 TA in from 17280 to 7640 bytes. Figures for an
AArch32 TA are 12040 to 5288 bytes.

Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
[jf: rebased onto mbedtls-2.27.0]
Signed-off-by: Jerome Forissier <jerome@forissier.org>