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2023-05-30meson: Split test for __int128_t type from __int128_t arithmeticRichard Henderson1-2/+2
Older versions of clang have missing runtime functions for arithmetic with -fsanitize=undefined (see 464e3671f9d5c), so we cannot use __int128_t for implementing Int128. But __int128_t is present, data movement works, and it can be used for atomic128. Probe for both CONFIG_INT128_TYPE and CONFIG_INT128, adjust qemu/int128.h to define Int128Alias if CONFIG_INT128_TYPE, and adjust the meson probe for atomics to use has_int128_type. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-05-02qemu/int128: Re-shuffle Int128Alias membersRichard Henderson1-2/+2
Clang 14, with --enable-tcg-interpreter errors with include/qemu/int128.h:487:16: error: alignment of field 'i' (128 bits) does not match the alignment of the first field in transparent union; transparent_union attribute ignored [-Werror,-Wignored-attributes] __int128_t i; ^ include/qemu/int128.h:486:12: note: alignment of first field is 64 bits Int128 s; ^ 1 error generated. By placing the __uint128_t member first, this is avoided. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20230501204625.277361-1-richard.henderson@linaro.org>
2023-02-04include/qemu/int128: Use Int128 structure for TCIRichard Henderson1-3/+22
We are about to allow passing Int128 to/from tcg helper functions, but libffi doesn't support __int128_t, so use the structure. In order for atomic128.h to continue working, we must provide a mechanism to frob between real __int128_t and the structure. Provide a new union, Int128Alias, for this. We cannot modify Int128 itself, as any changed alignment would also break libffi. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-06-20host-utils: Implemented unsigned 256-by-128 divisionLucas Mateus Castro (alqotel)1-0/+38
Based on already existing QEMU implementation, created an unsigned 256 bit by 128 bit division needed to implement the vector divide extended unsigned instruction from PowerISA3.1 Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220525134954.85056-5-lucas.araujo@eldorado.org.br> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-04-20softfloat: add float128_to_int128Matheus Ferst1-0/+2
Implements float128_to_int128 based on parts_float_to_int logic. Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220330175932.6995-7-matheus.ferst@eldorado.org.br> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-04-20qemu/int128: add int128_urshiftMatheus Ferst1-0/+19
Implement an unsigned right shift for Int128 values and add the same tests cases of int128_rshift in the unit test. Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220330175932.6995-3-matheus.ferst@eldorado.org.br> [danielhb: fixed long lines in test_urshift()] Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-04-06Replace config-time define HOST_WORDS_BIGENDIANMarc-André Lureau1-1/+1
Replace a config-time define with a compile time condition define (compatible with clang and gcc) that must be declared prior to its usage. This avoids having a global configure time define, but also prevents from bad usage, if the config header wasn't included before. This can help to make some code independent from qemu too. gcc supports __BYTE_ORDER__ from about 4.6 and clang from 3.2. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> [ For the s390x parts I'm involved in ] Acked-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220323155743.1585078-7-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-01-08qemu/int128: addition of div/rem 128-bit operationsFrédéric Pétrot1-0/+27
Addition of div and rem on 128-bit integers, using the 128/64->128 divu and 64x64->128 mulu in host-utils. These operations will be used within div/rem helpers in the 128-bit riscv target. Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr> Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20220106210108.138226-4-frederic.petrot@univ-grenoble-alpes.fr Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2021-10-27qemu/int128: Add int128_{not,xor}Frédéric Pétrot1-0/+20
Addition of not and xor on 128-bit integers. Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr> Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org> Message-Id: <20211025122818.168890-3-frederic.petrot@univ-grenoble-alpes.fr> [rth: Split out logical operations.] Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-08-27include/qemu/int128.h: introduce bswap128sMatheus Ferst1-1/+16
Changes the current bswap128 implementation to use __builtin_bswap128 when available, adds a bswap128 implementation for !CONFIG_INT128 builds, and introduces bswap128s based on bswap128. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> Message-Id: <20210826145656.2507213-2-matheus.ferst@eldorado.org.br> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-08-27include/qemu/int128.h: define struct Int128 according to the host endiannessMatheus Ferst1-7/+20
Suggested-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> Message-Id: <20210826141446.2488609-2-matheus.ferst@eldorado.org.br> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-06-16include/qemu/int128.h: Add function to create Int128 from int64_tPeter Maydell1-0/+10
int128_make64() creates an Int128 from an unsigned 64 bit value; add a function int128_makes64() creating an Int128 from a signed 64 bit value. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210614151007.4545-34-peter.maydell@linaro.org
2021-02-18qemu/int128: Add int128_orRichard Henderson1-0/+10
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20201021045149.1582203-2-richard.henderson@linaro.org>
2020-08-28qemu/int128: Add int128_lshiftRichard Henderson1-0/+16
Add left-shift to match the existing right-shift. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20200815013145.539409-2-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-10-26tcg: Add atomic128 helpersRichard Henderson1-0/+6
Force the use of cmpxchg16b on x86_64. Wikipedia suggests that only very old AMD64 (circa 2004) did not have this instruction. Further, it's required by Windows 8 so no new cpus will ever omit it. If we truely care about these, then we could check this at startup time and then avoid executing paths that use it. Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2016-10-26int128: Add int128_make128Richard Henderson1-5/+15
Allows Int128 to be used more generally, rather than having to begin with 64-bit inputs and accumulate. Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2016-10-26int128: Use __int128 if availableRichard Henderson1-1/+134
Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2016-10-26exec: Avoid direct references to Int128 partsRichard Henderson1-0/+10
Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2016-02-23include: Clean up includesPeter Maydell1-3/+0
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. NB: If this commit breaks compilation for your out-of-tree patchseries or fork, then you need to make sure you add #include "qemu/osdep.h" to any new .c files that you have. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com>
2014-05-30int128: Add int128_exts64()Alexey Kardashevskiy1-0/+5
This adds macro to extend signed 64bit value to signed 128bit value. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2014-04-18int128.h: Avoid undefined behaviours involving signed arithmeticPeter Maydell1-2/+2
Add casts when we're performing arithmetic on the .hi parts of an Int128, to avoid undefined behaviour. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2013-07-02int128: optimize and add test casesPaolo Bonzini1-8/+17
For add, the carry only requires checking one of the arguments. For sub and neg, we can similarly optimize computation of the carry. For ge, we can just do lexicographic order. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-06-20memory: make section size a 128-bit integerPaolo Bonzini1-0/+19
So far, the size of all regions passed to listeners could fit in 64 bits, because artificial regions (containers and aliases) are eliminated by the memory core, leaving only device regions which have reasonable sizes An IOMMU however cannot be eliminated by the memory core, and may have an artificial size, hence we may need 65 bits to represent its size. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini1-0/+116
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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