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A 'case' expression will force a stack frame (essentially in the same
way as a function call), unless it is at the end of a function.
In sys_core_fold there is an optimization that can optimize one-armed
cases such as:
case Expr of
Pat1 ->
DoSomething;
Pat2 ->
erlang:error(bad)
end,
MoreCode.
Because only one arm of the 'case' can succeed, the code after the
case can be move into the successful arm:
case Expr of
Pat1 ->
DoSomething,
MoreCode;
Pat2 ->
erlang:error(bad)
end.
Thus, the 'case' is at the end of the function and it will no longer
need a stack frame.
However, the optimization in sys_core_fold would not be applied if
there were more than one failing clause such as in this code:
case Expr of
Pat1 ->
DoSomething,
MoreCode;
Pat2 ->
erlang:error(bad);
_ ->
erlang:error(case_clause)
end.
Generalize the optimization to handle any number of failing
clauses at the end of the case.
Reported-by: bugs.erlang.org/browse/ERL-452
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* maint:
Updated OTP version
Update release notes
Update version numbers
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* maint-19:
Updated OTP version
Update release notes
Update version numbers
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Fix a proliferated typo in ssl
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array: fix spec typo
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* maint:
Updated OTP version
Update release notes
Update version numbers
Fix doc for the 'quiet' option; it defaults to false
asn1: Fix missing quotes of external encoding call
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
erts: Add missing release note
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* maint-20:
Updated OTP version
Update release notes
Update version numbers
Fix doc for the 'quiet' option; it defaults to false
asn1: Fix missing quotes of external encoding call
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
erts: Add missing release note
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* sverker/asn1/missing-quotes/OTP-14519:
asn1: Fix missing quotes of external encoding call
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* sverker/big-bxor-bug/ERL-450/OTP-14514:
erts: Fix bug in bxor of a big negative number
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* john/erts/fix-tcp-send-timeout/OTP-14509/ERL-448:
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
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* john/kernel/fix-disk-log-docs/OTP-14498:
Fix doc for the 'quiet' option; it defaults to false
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* sverker/missing-relnote/OTP-14494:
erts: Add missing release note
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* sverker/enif_whereis-bug:
erts: Fix bug in enif_whereis_pid/port
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* sverker/big-bxor-bug/ERL-450/OTP-14514:
erts: Fix bug in bxor of a big negative number
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* john/erts/fix-tcp-send-timeout/OTP-14509/ERL-448:
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
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* sverker/prealloc-race-bug/OTP-14491:
erts: Fix bug in quick alloc
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Fix typo in httpc.xml: http -> httpc
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* raimo/kernel/fix-spec-for-inet-get_rc-0/ERL-454:
Improve spec and doc for inet:get_rc/0
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into maint
* raimo/stdlib/stop-deprecated-warn-crypto-rand_bytes-1/ERL-459:
Change crypto:rand_bytes/1 deprecated -> removed
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* sverker/crypto/valgrind-compile-errors:
crypto: Fix compile errors for make target 'valgrind'
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introduced by 8e4a9864385242b962ce7446f7daa4f58cfecca5.
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Remove support for the non-smp emulators
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This refactor was done using the unifdef tool like this:
for file in $(find erts/ -name *.[ch]); do unifdef -t -f defile -o $file $file; done
where defile contained:
#define ERTS_SMP 1
#define USE_THREADS 1
#define DDLL_SMP 1
#define ERTS_HAVE_SMP_EMU 1
#define SMP 1
#define ERL_BITS_REENTRANT 1
#define ERTS_USE_ASYNC_READY_Q 1
#define FDBLOCK 1
#undef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
#define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 0
#define ERTS_POLL_USE_WAKEUP_PIPE 1
#define ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE 1
#undef ERTS_HAVE_PLAIN_EMU
#undef ERTS_SIGNAL_STATE
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