https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77308
Bug ID: 77308
Summary: surprisingly large stack usage for sha512 on arm
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: edlinger at gcc dot gnu.org
Target Milestone: ---
Created attachment 39479
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39479&action=edit
test case
I've noticed that openssl with no-asm but without -DOPENSSL_SMALL_FOOTPRINT
uses > 3600 byte of stack for a simple sha512 computation with -O3 on ARM.
Which is surprising, because on i386 the same function uses only 1016 byte,
and x86_64 uses only 256 bytes stack.
See the attached source code witch is stripped down from sha512.c
