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2017-09-28Eliminate MY_IS_SSMALL()Björn Gustavsson
For a long time, there has been the two macros IS_SSMALL() and MY_IS_SSMALL() that do exactly the same thing. There should only be one, and it should be called IS_SSMALL(). However, we must decide which implementation to use. When MY_IS_SSMALL() was introduced a long time ago, it was the most efficient. In a modern C compiler, there might not be any difference. To find out, I used the following small C program to examine the code generation: #include <stdio.h> typedef unsigned int Uint32; typedef unsigned long Uint64; typedef long Sint; #define SWORD_CONSTANT(Const) Const##L #define SMALL_BITS (64-4) #define MAX_SMALL ((SWORD_CONSTANT(1) << (SMALL_BITS-1))-1) #define MIN_SMALL (-(SWORD_CONSTANT(1) << (SMALL_BITS-1))) #define MY_IS_SSMALL32(x) (((Uint32) ((((x)) >> (SMALL_BITS-1)) + 1)) < 2) #define MY_IS_SSMALL64(x) (((Uint64) ((((x)) >> (SMALL_BITS-1)) + 1)) < 2) #define MY_IS_SSMALL(x) (sizeof(x) == sizeof(Uint32) ? MY_IS_SSMALL32(x) : MY_IS_SSMALL64(x)) #define IS_SSMALL(x) (((x) >= MIN_SMALL) && ((x) <= MAX_SMALL)) void original(Sint n) { if (IS_SSMALL(n)) { printf("yes\n"); } } void enhanced(Sint n) { if (MY_IS_SSMALL(n)) { printf("yes\n"); } } gcc 7.2 produced the following code for the original() function: .LC0: .string "yes" original(long): movabs rax, 576460752303423488 add rdi, rax movabs rax, 1152921504606846975 cmp rdi, rax jbe .L4 rep ret .L4: mov edi, OFFSET FLAT:.LC0 jmp puts clang 5.0.0 produced the following code which is slightly better: original(long): movabs rax, 576460752303423488 add rax, rdi shr rax, 60 jne .LBB0_1 mov edi, .Lstr jmp puts # TAILCALL .LBB0_1: ret .Lstr: .asciz "yes" However, in the context of beam_emu.c, clang could produce similar to what gcc produced. gcc 7.2 produced the following code when MY_IS_SSMALL() was used: .LC0: .string "yes" enhanced(long): sar rdi, 59 add rdi, 1 cmp rdi, 1 jbe .L4 rep ret .L4: mov edi, OFFSET FLAT:.LC0 jmp puts clang produced similar code. This code seems to be the cheapest. There are four instructions, and there is no loading of huge integer constants.
2017-09-27Merge branch 'maint'Sverker Eriksson
2017-09-27Add git pre-push hookSverker Eriksson
2017-09-27Merge branch 'lukas/erts/fix_threads_error_printout'Lukas Larsson
* lukas/erts/fix_threads_error_printout: erts: Print the error reason when threads fail to start
2017-09-27Merge branch 'kvakvs/zero-size-read_file/ERL-327/PR-1524/OTP-14637'Lukas Larsson
* kvakvs/zero-size-read_file/ERL-327/PR-1524/OTP-14637: erts: On zero-size files attempt to read until EOF
2017-09-27erts: On zero-size files attempt to read until EOFDmytro Lytovchenko
2017-09-26Merge branch 'maint'Henrik Nord
2017-09-26Merge branch 'dgud/stdlib/unicode-string-bench'Dan Gudmundsson
* dgud/stdlib/unicode-string-bench: stdlib: Add unicode string benchmarks
2017-09-26stdlib: Add unicode string benchmarksDan Gudmundsson
2017-09-25Merge pull request #1572 from gregors/update_docsRickard Green
fix off by one error in docs
2017-09-25Update primary bootstrapBjörn Gustavsson
2017-09-25Merge branch 'bjorn/speed-up-disassembler'Björn Gustavsson
* bjorn/speed-up-disassembler: Add testing of erts_debug:df() to the emulator smoke tests Speed up erts_debug:df()
2017-09-22Updated OTP versionOTP-20.1Erlang/OTP
2017-09-22Update release notesErlang/OTP
2017-09-22Update version numbersErlang/OTP
2017-09-22Merge branch 'maint'John Högberg
2017-09-22Correctly append sub-binaries in iolist_to_iovecJohn Högberg
The byte_offset of sub-binaries wasn't taken into account for ProcBins, subtly ruining the results. The test suite didn't catch it since it didn't check for sub-binaries in particular, and only checked for equality between variations -- not whether the output was equal to the input.
2017-09-22Merge branch 'maint'Dan Gudmundsson
* maint: stdlib: Remove gs removed warning
2017-09-22Merge branch 'dgud/stdlib/remove-gs-depr' into maintDan Gudmundsson
* dgud/stdlib/remove-gs-depr: stdlib: Remove gs removed warning
2017-09-22Merge branch 'maint'Hans Nilsson
2017-09-22Merge branch 'hans/public_key/fix_broken_marker' into maintHans Nilsson
2017-09-22public_key: Add app (ssl) to marker in seelalso tagHans Nilsson
2017-09-22stdlib: Remove gs removed warningDan Gudmundsson
Caused warnings which could not be suppressed, if old 'gs' application was compiled and used together with otp-20, which is fair usage even if OTP does not support the application anymore.
2017-09-22Add testing of erts_debug:df() to the emulator smoke testsBjörn Gustavsson
It is too easy to break the disassembler. Make sure that we notice.
2017-09-22Speed up erts_debug:df()Björn Gustavsson
The test case erts_debug_SUITE:df/1 in the emulator test suite is about 4 times faster with this change.
2017-09-21erts: Print the error reason when threads fail to startLukas Larsson
2017-09-21Merge branch 'siri/observer/dont-use-old-string-api'Siri Hansen
* siri/observer/dont-use-old-string-api: [cdv] Don't use old string API
2017-09-21Merge branch 'maint'Henrik Nord
2017-09-21Update copyright yearHenrik Nord
2017-09-21Merge branch 'maint'Anders Svensson
2017-09-21Merge branch 'anders/diameter/doc/OTP-14561' into maintAnders Svensson
* anders/diameter/doc/OTP-14561: Document new(ish) options in diameter_tcp/sctp
2017-09-21Merge branch 'anders/diameter/SoC/OTP-10927' into maintAnders Svensson
* anders/diameter/SoC/OTP-10927: Simplify/complete Standards Compliance doc
2017-09-21Merge branch 'maint'Lars Thorsen
2017-09-21Merge branch 'lars/make/fop-font-cache/OTP-14622' into maintLars Thorsen
* lars/make/fop-font-cache/OTP-14622: Change number of parameters Fix fop font-cache handling during pdf build
2017-09-21Change number of parametersLars Thorsen
2017-09-21Fix fop font-cache handling during pdf buildLars Thorsen
Two parallell doc builds running fop (as same user) could both update the fop font-cache at the same time. The cache is now created as an artifact in the build process.
2017-09-21Merge branch 'maint'Hans Bolinder
* maint: fprof: Make sure the receiving file can handle Unicode
2017-09-21Merge branch 'hasse/tools/fprof_unicode_fix' into maintHans Bolinder
* hasse/tools/fprof_unicode_fix: fprof: Make sure the receiving file can handle Unicode
2017-09-20Simplify/complete Standards Compliance docAnders Svensson
With a table. Probably no one wants to read a commented RFC, it's been unfinished for some time, and it's difficult to get an overview from it.
2017-09-20Document new(ish) options in diameter_tcp/sctpAnders Svensson
See commits d3829525 (unordered), c591056b (packet), eadf4efc (sender), 636a7199 (tcp message_cb), 373cd07c (sctp message_cb)
2017-09-20[cdv] Don't use old string APISiri Hansen
2017-09-20Merge branch 'maint'Ingela Anderton Andin
2017-09-20Merge branch 'ingela/public_key/cert-gen/OTP-14181' into maintIngela Anderton Andin
* ingela/public_key/cert-gen/OTP-14181: public_key, ssl: Prepare for release public_key, ssl: Provide certitifate test data generation function in public_key
2017-09-20public_key, ssl: Prepare for releaseIngela Anderton Andin
OTP-14236 requires ssl runtime dependencies to update to latest public_key. OTP-14181 makes ssl test cases dependent on latest version latest public_key.
2017-09-20public_key, ssl: Provide certitifate test data generation function in public_keyIngela Anderton Andin
The ssl application uses the new function in many of its test cases.
2017-09-20Merge branch 'maint'Dan Gudmundsson
* maint: erts, stdlib: Fix xmllint warning Update runtime deps to depend on new stdlib functionality
2017-09-20Merge branch 'dgud/update-runtime-deps' into maintDan Gudmundsson
* dgud/update-runtime-deps: Update runtime deps to depend on new stdlib functionality
2017-09-20erts, stdlib: Fix xmllint warningHans Bolinder
2017-09-20fprof: Make sure the receiving file can handle UnicodeHans Bolinder
It is assumed that I/O devices can handle character codes greater than 255.
2017-09-19Merge branch 'maint'Siri Hansen
Conflicts: lib/observer/src/crashdump_viewer.erl lib/sasl/src/sasl.appup.src lib/stdlib/src/stdlib.appup.src
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