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A modified version of compiler-builtins for zynq, with fast memcpy implementation adapted from newlib.
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Matt Ickstadt 3986d1e3b6 Add a `Porting Reminders` section to the README 2016-08-21 15:49:32 -05:00
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README.md

Build Status

rustc-builtins

[WIP] Porting compiler-rt intrinsics to Rust

See rust-lang/rust#35437.

Contributing

  1. Pick one or more intrinsics from the [pending list][/#progress].
  2. Fork this repository
  3. Port the intrinsic(s) and their corresponding unit tests from their C implementation to Rust.
  4. Send a Pull Request (PR)
  5. Once the PR passes our extensive testing infrastructure, we'll merge it!
  6. Celebrate 🎉

Porting Reminders

  1. Rust and C have slightly different operator precedence. C evaluates comparisons (== !=) before bitwise operations (& | ^), while Rust evaluates the other way.
  2. C assumes wrapping operations everywhere. Rust panics on overflow when in debug mode. Consider using the Wrapping type or the explicit wrapping_* functions where applicable.
  3. Note C implicit casts, especially integer promotion. Rust is much more explicit about casting, so be sure that any cast which affects the output is ported to the Rust implementation.
  4. Rust has many functions for integer or floating point manipulation in the standard library. Consider using one of these functions rather than porting a new one.

Progress

  • adddf3.c
  • addsf3.c
  • arm/adddf3vfp.S
  • arm/addsf3vfp.S
  • arm/aeabi_dcmp.S
  • arm/aeabi_fcmp.S
  • arm/aeabi_idivmod.S
  • arm/aeabi_ldivmod.S
  • arm/aeabi_memcpy.S
  • arm/aeabi_memmove.S
  • arm/aeabi_memset.S
  • arm/aeabi_uidivmod.S
  • arm/aeabi_uldivmod.S
  • arm/divdf3vfp.S
  • arm/divmodsi4.S (generic version is done)
  • arm/divsf3vfp.S
  • arm/divsi3.S (generic version is done)
  • arm/eqdf2vfp.S
  • arm/eqsf2vfp.S
  • arm/extendsfdf2vfp.S
  • arm/fixdfsivfp.S
  • arm/fixsfsivfp.S
  • arm/fixunsdfsivfp.S
  • arm/fixunssfsivfp.S
  • arm/floatsidfvfp.S
  • arm/floatsisfvfp.S
  • arm/floatunssidfvfp.S
  • arm/floatunssisfvfp.S
  • arm/gedf2vfp.S
  • arm/gesf2vfp.S
  • arm/gtdf2vfp.S
  • arm/gtsf2vfp.S
  • arm/ledf2vfp.S
  • arm/lesf2vfp.S
  • arm/ltdf2vfp.S
  • arm/ltsf2vfp.S
  • arm/modsi3.S (generic version is done)
  • arm/muldf3vfp.S
  • arm/mulsf3vfp.S
  • arm/nedf2vfp.S
  • arm/negdf2vfp.S
  • arm/negsf2vfp.S
  • arm/nesf2vfp.S
  • arm/softfloat-alias.list
  • arm/subdf3vfp.S
  • arm/subsf3vfp.S
  • arm/truncdfsf2vfp.S
  • arm/udivmodsi4.S (generic version is done)
  • arm/udivsi3.S (generic version is done)
  • arm/umodsi3.S (generic version is done)
  • arm/unorddf2vfp.S
  • arm/unordsf2vfp.S
  • ashldi3.c
  • ashrdi3.c
  • divdf3.c
  • divdi3.c
  • divmoddi4.c
  • divmodsi4.c
  • divsf3.c
  • divsi3.c
  • extendhfsf2.c
  • extendsfdf2.c
  • fixdfdi.c
  • fixdfsi.c
  • fixsfdi.c
  • fixsfsi.c
  • fixunsdfdi.c
  • fixunsdfsi.c
  • fixunssfdi.c
  • fixunssfsi.c
  • floatdidf.c
  • floatdisf.c
  • floatsidf.c
  • floatsisf.c
  • floatundidf.c
  • floatundisf.c
  • floatunsidf.c
  • floatunsisf.c
  • i386/ashldi3.S
  • i386/ashrdi3.S
  • i386/chkstk.S
  • i386/chkstk2.S
  • i386/divdi3.S
  • i386/lshrdi3.S
  • i386/moddi3.S
  • i386/muldi3.S
  • i386/udivdi3.S
  • i386/umoddi3.S
  • lshrdi3.c
  • moddi3.c
  • modsi3.c
  • muldf3.c
  • muldi3.c
  • mulodi4.c
  • mulosi4.c
  • mulsf3.c
  • powidf2.c
  • powisf2.c
  • subdf3.c
  • subsf3.c
  • truncdfhf2.c
  • truncdfsf2.c
  • truncsfhf2.c
  • udivdi3.c
  • udivmoddi4.c
  • udivmodsi4.c
  • udivsi3.c
  • umoddi3.c
  • umodsi3.c
  • x86_64/chkstk.S
  • x86_64/chkstk2.S

These builtins are needed to support 128-bit integers, which are in the process of being added to Rust.

  • ashlti3.c
  • ashrti3.c
  • divti3.c
  • fixdfti.c
  • fixsfti.c
  • fixunsdfti.c
  • fixunssfti.c
  • floattidf.c
  • floattisf.c
  • floatuntidf.c
  • floatuntisf.c
  • lshrti3.c
  • modti3.c
  • muloti4.c
  • multi3.c
  • udivmodti4.c
  • udivti3.c
  • umodti3.c

Unimplemented functions

These builtins involve floating-point types ("f128", "f80" and complex numbers) that are not supported by Rust.

  • addtf3.c
  • comparetf2.c
  • divdc3.c
  • divsc3.c
  • divtc3.c
  • divtf3.c
  • divxc3.c
  • extenddftf2.c
  • extendsftf2.c
  • fixtfdi.c
  • fixtfsi.c
  • fixtfti.c
  • fixunstfdi.c
  • fixunstfsi.c
  • fixunstfti.c
  • fixunsxfdi.c
  • fixunsxfsi.c
  • fixunsxfti.c
  • fixxfdi.c
  • fixxfti.c
  • floatditf.c
  • floatdixf.c
  • floatsitf.c
  • floattixf.c
  • floatunditf.c
  • floatundixf.c
  • floatunsitf.c
  • floatuntixf.c
  • i386/floatdixf.S
  • i386/floatundixf.S
  • muldc3.c
  • mulsc3.c
  • multc3.c
  • multf3.c
  • mulxc3.c
  • powitf2.c
  • powixf2.c
  • ppc/divtc3.c
  • ppc/fixtfdi.c
  • ppc/fixunstfdi.c
  • ppc/floatditf.c
  • ppc/floatunditf.c
  • ppc/gcc_qadd.c
  • ppc/gcc_qdiv.c
  • ppc/gcc_qmul.c
  • ppc/gcc_qsub.c
  • ppc/multc3.c
  • subtf3.c
  • trunctfdf2.c
  • trunctfsf2.c
  • x86_64/floatdixf.c
  • x86_64/floatundixf.S

These builtins are never called by LLVM.

  • absvdi2.c
  • absvsi2.c
  • absvti2.c
  • addvdi3.c
  • addvsi3.c
  • addvti3.c
  • arm/aeabi_cdcmp.S
  • arm/aeabi_cdcmpeq_check_nan.c
  • arm/aeabi_cfcmp.S
  • arm/aeabi_cfcmpeq_check_nan.c
  • arm/aeabi_div0.c
  • arm/aeabi_drsub.c
  • arm/aeabi_frsub.c
  • arm/aeabi_memcmp.S
  • arm/bswapdi2.S
  • arm/bswapsi2.S
  • arm/clzdi2.S
  • arm/clzsi2.S
  • arm/comparesf2.S
  • arm/restore_vfp_d8_d15_regs.S
  • arm/save_vfp_d8_d15_regs.S
  • arm/switch16.S
  • arm/switch32.S
  • arm/switch8.S
  • arm/switchu8.S
  • clzdi2.c
  • clzsi2.c
  • clzti2.c
  • cmpdi2.c
  • cmpti2.c
  • comparedf2.c
  • comparesf2.c
  • ctzdi2.c
  • ctzsi2.c
  • ctzti2.c
  • ffsdi2.c
  • ffsti2.c
  • mulvdi3.c
  • mulvsi3.c
  • mulvti3.c
  • negdf2.c
  • negdi2.c
  • negsf2.c
  • negti2.c
  • negvdi2.c
  • negvsi2.c
  • negvti2.c
  • paritydi2.c
  • paritysi2.c
  • parityti2.c
  • popcountdi2.c
  • popcountsi2.c
  • popcountti2.c
  • ppc/restFP.S
  • ppc/saveFP.S
  • subvdi3.c
  • subvsi3.c
  • subvti3.c
  • ucmpdi2.c
  • ucmpti2.c
  • udivmodti4.c

Rust only exposes atomic types on platforms that support them, and therefore does not need to fall back to software implementations.

  • arm/sync_fetch_and_add_4.S
  • arm/sync_fetch_and_add_8.S
  • arm/sync_fetch_and_and_4.S
  • arm/sync_fetch_and_and_8.S
  • arm/sync_fetch_and_max_4.S
  • arm/sync_fetch_and_max_8.S
  • arm/sync_fetch_and_min_4.S
  • arm/sync_fetch_and_min_8.S
  • arm/sync_fetch_and_nand_4.S
  • arm/sync_fetch_and_nand_8.S
  • arm/sync_fetch_and_or_4.S
  • arm/sync_fetch_and_or_8.S
  • arm/sync_fetch_and_sub_4.S
  • arm/sync_fetch_and_sub_8.S
  • arm/sync_fetch_and_umax_4.S
  • arm/sync_fetch_and_umax_8.S
  • arm/sync_fetch_and_umin_4.S
  • arm/sync_fetch_and_umin_8.S
  • arm/sync_fetch_and_xor_4.S
  • arm/sync_fetch_and_xor_8.S
  • arm/sync_synchronize.S
  • atomic.c
  • atomic_flag_clear.c
  • atomic_flag_clear_explicit.c
  • atomic_flag_test_and_set.c
  • atomic_flag_test_and_set_explicit.c
  • atomic_signal_fence.c
  • atomic_thread_fence.c

Miscellaneous functionality that is not used by Rust.

  • apple_versioning.c
  • clear_cache.c
  • emutls.c
  • enable_execute_stack.c
  • eprintf.c
  • gcc_personality_v0.c
  • trampoline_setup.c

Floating-point implementations of builtins that are only called from soft-float code. It would be better to simply use the generic soft-float versions in this case.

  • i386/floatdidf.S
  • i386/floatdisf.S
  • i386/floatundidf.S
  • i386/floatundisf.S
  • x86_64/floatundidf.S
  • x86_64/floatundisf.S
  • x86_64/floatdidf.c
  • x86_64/floatdisf.c

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.