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* [WebAssembly] CFG stackify support for exception handlingHeejin Ahn2018-08-162-0/+326
| | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This adds support for exception handling to CFGStackify pass. This only adds TRY / END_TRY markers and DOES NOT yet fix unwind mismatches that can be created by the linearization of the CFG into the structural wasm format. The mismatch fix will be added by following patches. In detail, this patch - Added support for TRY / END_TRY markers to support EH - Changed many static functions into class member functions as they take too many arguments now - Added several more bookeeping data structures - Refactored routines that decide where to insert markers, because without refactoring this got too complicated as we added support for new kinds of markers (TRY/END_TRY). - Rewrote rethrow instructions' BB arguments to relative depths in EH pad stack. Reviewers: dschuff, sunfish Subscribers: sbc100, jgravelle-google, llvm-commits Differential Revision: https://reviews.llvm.org/D48273 llvm-svn: 339967
* [SelectionDAG] Improve the legalisation lowering of UMULO.Eli Friedman2018-08-161-0/+94
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no way in the universe, that doing a full-width division in software will be faster than doing overflowing multiplication in software in the first place, especially given that this same full-width multiplication needs to be done anyway. This patch replaces the previous implementation with a direct lowering into an overflowing multiplication algorithm based on half-width operations. Correctness of the algorithm was verified by exhaustively checking the output of this algorithm for overflowing multiplication of 16 bit integers against an obviously correct widening multiplication. Baring any oversights introduced by porting the algorithm to DAG, confidence in correctness of this algorithm is extremely high. Following table shows the change in both t = runtime and s = space. The change is expressed as a multiplier of original, so anything under 1 is “better” and anything above 1 is worse. +-------+-----------+-----------+-------------+-------------+ | Arch | u64*u64 t | u64*u64 s | u128*u128 t | u128*u128 s | +-------+-----------+-----------+-------------+-------------+ | X64 | - | - | ~0.5 | ~0.64 | | i686 | ~0.5 | ~0.6666 | ~0.05 | ~0.9 | | armv7 | - | ~0.75 | - | ~1.4 | +-------+-----------+-----------+-------------+-------------+ Performance numbers have been collected by running overflowing multiplication in a loop under `perf` on two x86_64 (one Intel Haswell, other AMD Ryzen) based machines. Size numbers have been collected by looking at the size of function containing an overflowing multiply in a loop. All in all, it can be seen that both performance and size has improved except in the case of armv7 where code size has regressed for 128-bit multiply. u128*u128 overflowing multiply on 32-bit platforms seem to benefit from this change a lot, taking only 5% of the time compared to original algorithm to calculate the same thing. The final benefit of this change is that LLVM is now capable of lowering the overflowing unsigned multiply for integers of any bit-width as long as the target is capable of lowering regular multiplication for the same bit-width. Previously, 128-bit overflowing multiply was the widest possible. Patch by Simonas Kazlauskas! Differential Revision: https://reviews.llvm.org/D50310 llvm-svn: 339922
* [WebAssembly] SIMD replace_laneDerek Schuff2018-08-151-0/+68
| | | | | | | | | | Implement and test replace_lane instructions. Patch by Thomas Lively Differential Revision: https://reviews.llvm.org/D50750 llvm-svn: 339786
* [WebAssembly] SIMD SplatsDerek Schuff2018-08-151-0/+79
| | | | | | | | | | Implement and test SIMD splat ops. Patch by Thomas Lively Differential Revision: https://reviews.llvm.org/D50741 llvm-svn: 339744
* [WebAssembly] Delete a specific push number from test expectationsHeejin Ahn2018-08-141-1/+1
| | | | | | | | | | | | | | Summary: This shouldn't have been a specific number but rather a regex. This was a part of rL339474 which got reverted. Reviewers: aardappel Subscribers: dschuff, sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D50728 llvm-svn: 339736
* [WebAssembly] SIMD encoding testsHeejin Ahn2018-08-142-79/+79
| | | | | | | | | | | | | | | Modifies existing SIMD tests to also check that SIMD instructions are lowered to the expected bytes. This CL depends on D50597. Reviewers: aheejin Subscribers: sunfish, jgravelle-google, sbc100, llvm-commits Differential Revision: https://reviews.llvm.org/D50660 Patch by Thomas Lively (tlively) llvm-svn: 339712
* [WebAssembly] SIMD extract_laneHeejin Ahn2018-08-141-0/+142
| | | | | | | | | | | | | | | | | Implement instruction selection for all versions of the extract_lane instruction. Use explicit sext/zext to differentiate between extract_lane_s and extract_lane_u for applicable types, otherwise default to extract_lane_u. Reviewers: aheejin Subscribers: sunfish, jgravelle-google, sbc100, llvm-commits Differential Revision: https://reviews.llvm.org/D50597 Patch by Thomas Lively (tlively) llvm-svn: 339707
* Revert "[WebAssembly] Added default stack-only instruction mode for MC."Wouter van Oortmerssen2018-08-1381-303/+107
| | | | | | This reverts commit 917a99b71ce21c975be7bfbf66f4040f965d9f3c. llvm-svn: 339630
* [WebAssembly] Added default stack-only instruction mode for MC.Wouter van Oortmerssen2018-08-1081-107/+303
| | | | | | | | | | | | | | | | | | | | | | | Summary: Moved Explicit Locals pass to last. Made that pass obligatory. Made it convert from register to stack based instructions, and removed the registers. Fixes to related code that was expecting register based instructions. Added the correct testing flag to all tests, depending on what the format they were expecting so far. Translated one test to stack format as example: reg-stackify-stack.ll tested: llvm-lit -v `find test -name WebAssembly` unittests/MC/* Reviewers: dschuff, sunfish Subscribers: jfb, llvm-commits, aheejin, eraman, jgravelle-google, sbc100 Differential Revision: https://reviews.llvm.org/D50568 llvm-svn: 339474
* [WebAssembly] Gate i64x2 and f64x2 on -wasm-enable-unimplementedHeejin Ahn2018-08-091-2/+11
| | | | | | | | | | | | | | | | | | Summary: i64x2 and f64x2 operations are not implemented in V8, so we normally do not want to emit them. However, they are in the SIMD spec proposal, so we still want to be able to test them in the toolchain. This patch adds a flag to enable their emission. Reviewers: aheejin, dschuff Subscribers: sunfish, jgravelle-google, sbc100, llvm-commits Differential Revision: https://reviews.llvm.org/D50423 Patch by Thomas Lively (tlively) llvm-svn: 339407
* [WebAssembly] Update SIMD binary arithmeticDerek Schuff2018-08-071-4/+93
| | | | | | | | | | | | Add missing SIMD types (v2f64) and binary ops. Also adds tablegen support for automatically prepending prefix byte to SIMD opcodes. Differential Revision: https://reviews.llvm.org/D50292 Patch by Thomas Lively llvm-svn: 339186
* [WebAssembly] CFG sort support for exception handlingHeejin Ahn2018-08-071-0/+263
| | | | | | | | | | | | | | | | | Summary: This patch extends CFGSort pass to support exception handling. Once it places a loop header, it does not place blocks that are not dominated by the loop header until all the loop blocks are sorted. This patch extends the same algorithm to exception 'catch' part, using the information calculated by WebAssemblyExceptionInfo class. Reviewers: dschuff, sunfish Subscribers: sbc100, jgravelle-google, llvm-commits Differential Revision: https://reviews.llvm.org/D46500 llvm-svn: 339172
* [WebAssembly] Enable atomic expansion for unsupported atomicrmwsHeejin Ahn2018-08-071-0/+240
| | | | | | | | | | | | | | | | Summary: Wasm does not have direct counterparts to some of LLVM IR's atomicrmw instructions (min, max, umin, umax, and nand). This enables atomic expansion using cmpxchg instruction within a loop for those atomicrmw instructions. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49440 llvm-svn: 339084
* [WebAssembly] Cleanup of the way globals and global flags are handledNicholas Wilson2018-08-034-46/+46
| | | | | | Differential Revision: https://reviews.llvm.org/D44030 llvm-svn: 338894
* [WebAssembly] Support for atomic.wait / atomic.wake instructionsHeejin Ahn2018-08-021-0/+266
| | | | | | | | | | | | | | Summary: This adds support for atomic.wait / atomic.wake instructions in the wasm thread proposal. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49395 llvm-svn: 338770
* [WebAssembly] Ensure bitcasts that would result in invalid wasm are removed ↵Sam Clegg2018-08-024-36/+68
| | | | | | | | | | | | by FixFunctionBitcasts Rather than allowing invalid bitcasts to be lowered to wasm call instructions that won't validate, generate wrappers that contain unreachable thereby delaying the error until runtime. Differential Revision: https://reviews.llvm.org/D49517 llvm-svn: 338744
* [WebAssembly] Support for a ternary atomic RMW instructionHeejin Ahn2018-08-013-0/+745
| | | | | | | | | | | | Summary: This adds support for a ternary atomic RMW instruction: cmpxchg. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49195 llvm-svn: 338617
* Revert "[WebAssembly] Added default stack-only instruction mode for MC."Wouter van Oortmerssen2018-07-2779-299/+103
| | | | | | | This reverts commit d3c9af4179eae7793d1487d652e2d4e23844555f. (SVN revision 338164) llvm-svn: 338176
* [WebAssembly] Added default stack-only instruction mode for MC.Wouter van Oortmerssen2018-07-2779-103/+299
| | | | | | | | | | | | | | | | | | | | | | | Summary: Moved Explicit Locals pass to last. Made that pass obligatory. Made it convert from register to stack based instructions, and removed the registers. Fixes to related code that was expecting register based instructions. Added the correct testing flag to all tests, depending on what the format they were expecting so far. Translated one test to stack format as example: reg-stackify-stack.ll tested: llvm-lit -v `find test -name WebAssembly` unittests/MC/* Reviewers: dschuff, sunfish Subscribers: sbc100, jgravelle-google, eraman, aheejin, llvm-commits Differential Revision: https://reviews.llvm.org/D49160 llvm-svn: 338164
* [WebAssembly] Add tests for weaker memory consistency orderingsHeejin Ahn2018-07-241-0/+141
| | | | | | | | | | | | | | | | Summary: Currently all wasm atomic memory access instructions are sequentially consistent, so even if LLVM IR specifies weaker orderings than that, we should upgrade them to sequential ordering and treat them in the same way. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49194 llvm-svn: 337854
* [WebAssembly] Add missing -mattr=+exception-handling guardsHeejin Ahn2018-07-181-1/+2
| | | | | | | | | | | | | | Summary: The use of exception handling instructions should only be enabled with `-mattr=+exception-handling` option. Reviewers: jgravelle-google Subscribers: dschuff, sbc100, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49391 llvm-svn: 337425
* [WebAssembly] Update WebAssemblyLowerEmscriptenEHSjLj to handle separate ↵Sam Clegg2018-07-172-34/+34
| | | | | | | | | | | | | | | | | | | | | compilation Previously we were assuming whole program compilation. Now that separate compilation is a thing we need to update this pass. Firstly, it can no longer assert on the existence of malloc and free. This functions might not be in the current translation unit. If we need them then we will generate not imports for them. Secondly the global helper function we create should be marked as weak since we will be generating a separate copy in each translation unit. Finally the names of the symbols used must be unique and fixed since they need to agree across translation units. Differential Revision: https://reviews.llvm.org/D49263 llvm-svn: 337301
* Add -allow-deprecated-dag-overlap to one of the experimental webassembly ↵Eric Christopher2018-07-121-1/+1
| | | | | | target tests. llvm-svn: 336870
* [WebAssembly] Add pass to infer prototypes for prototype-less functionsSam Clegg2018-07-111-0/+20
| | | | | | | | See https://bugs.llvm.org/show_bug.cgi?id=35385 Differential Revision: https://reviews.llvm.org/D48471 llvm-svn: 336759
* [WebAssembly] Add missing a few {{$}}s to a testHeejin Ahn2018-07-101-5/+5
| | | | llvm-svn: 336691
* [WebAssembly] Support for binary atomic RMW instructionsHeejin Ahn2018-07-092-0/+1274
| | | | | | | | | | | | | | | | | | Summary: This adds support for binary atomic read-modify-write instructions: add, sub, and, or, xor, and xchg. This does not yet support translations of some of LLVM IR atomicrmw instructions (nand, max, min, umax, and umin) that do not have a direct counterpart in wasm instructions. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49088 llvm-svn: 336615
* [WebAssembly] Improve readability of load/stores and tests. NFC.Heejin Ahn2018-07-094-348/+659
| | | | | | | | | | | | | | | | | Summary: - Changed variable/function names to be more consistent - Improved comments in test files - Added more tests - Fixed a few typos - Misc. cosmetic changes Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D49087 llvm-svn: 336598
* Partially revert r336268 in address-offsets.llKrasimir Georgiev2018-07-051-40/+40
| | | | | | | | | | | | | | Summary: There the typos are intentional, explicitly introduced to disable these cases in r280285. Reviewers: bkramer Reviewed By: bkramer Subscribers: dschuff, sbc100, jgravelle-google, aheejin, llvm-commits Differential Revision: https://reviews.llvm.org/D48962 llvm-svn: 336336
* NFC - Various typo fixes in testsGabor Buella2018-07-041-40/+40
| | | | llvm-svn: 336268
* [WebAssembly] Support for atomic storesHeejin Ahn2018-07-024-1/+408
| | | | | | | | | | | | Summary: Add support for atomic store instructions. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D48839 llvm-svn: 336145
* [WebAssembly] Fix fast-isel optimization of branch conditions.Dan Gohman2018-07-021-0/+48
| | | | | | | | | | | LLVM doesn't guarantee anything about the high bits of a register holding an i1 value at the IR level, so don't translate LLVM IR i1 values directly into WebAssembly conditional branch operands. WebAssembly's conditional branches do demand all 32 bits be valid. Fixes PR38019. llvm-svn: 336138
* [WebAssembly] Convert remaining tests from elf to wasm output formatSam Clegg2018-07-023-11/+12
| | | | | | Differential Revision: https://reviews.llvm.org/D48748 llvm-svn: 336116
* [WebAssembly] Update comments for non-splat pow2 vector test caseHeejin Ahn2018-06-291-1/+3
| | | | | | | | | | | | | | | | | | | Summary: After rL335727, (sdiv X, 1) is treated as a special case, so we can safely transform 'sdiv's in non-splat pow vectors into 'shr's even when some of its entries are '1'. The test expectations have been already fixed in rL335771, but the comments were out of date. Also changed the filename from `vector_sdiv.ll` to `vector-sdiv.ll` to be consistent with other test file names. Reviewers: RKSimon Subscribers: dschuff, sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D48692 llvm-svn: 336018
* [WebAssembly] Try fixing test/CodeGen/WebAssembly/vector_sdiv.llFangrui Song2018-06-271-3/+3
| | | | llvm-svn: 335771
* [WebAssembly] Fix lowering of varargs functions with non-legal fixed arguments.Dan Gohman2018-06-261-0/+21
| | | | | | | | | | | CallLoweringInfo's NumFixedArgs field gives the number of fixed arguments before legalization. The ISD::OutputArg "Outs" array holds legalized arguments, so when indexing into it to find the non-fixed arguemn, we need to use the number of arguments after legalization. Fixes PR37934. llvm-svn: 335576
* [WebAssembly] Add WebAssemblyLateEHPrepare passHeejin Ahn2018-06-251-5/+74
| | | | | | | | | | | | | | | | Summary: Add WebAssemblyLateEHPrepare pass that does several small jobs for exception handling. This runs before CFGSort, and is different from WasmEHPrepare pass that runs before ISel, even though the names are similar. Reviewers: dschuff, majnemer Subscribers: sbc100, jgravelle-google, sunfish, mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D46803 llvm-svn: 335438
* [WebAssembly] Fix liveness tracking info after drop insertionHeejin Ahn2018-06-191-0/+23
| | | | | | | | | | | | | | | | | | | | Summary: This fixes liveness tracking information after `drop` instruction insertion in ExplicitLocals pass. When a drop instruction is inserted to drop a dead register operand, the original operand should be marked not dead anymore because it is now used by the new drop instruction. And the operand to the new drop instruction should be marked killed instead. This bug caused some programs to fail when `llc` is run with `-verify-machineinstrs` option. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D48253 llvm-svn: 335074
* [WebAssembly] Update to the new names for the memory intrinsics.Dan Gohman2018-05-311-0/+21
| | | | | | | | | The WebAssembly committee has decided on the names `memory.size` and `memory.grow` for the memory intrinsics, so update the LLVM intrinsics to follow those names, keeping both sets of old names in place for compatibility. llvm-svn: 333708
* [WebAssembly] Fix the signatures for the __mulo* libcalls.Dan Gohman2018-05-311-0/+19
| | | | | | | | The __mulo* libcalls have an extra i32* to return the overflow value. Fixes PR37401. llvm-svn: 333706
* [WebAssembly] Support instruction selection for catching exceptionsHeejin Ahn2018-05-311-8/+75
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This lowers exception catching-related instructions: 1. Lowers `wasm.catch` intrinsic to `catch` instruction 2. Removes `catchpad` and `cleanuppad` instructions; they are not necessary after isel phase. (`MachineBasicBlock::isEHFuncletEntry()` or `MachineBasicBlock::isEHPad()` can be used instead.) 3. Lowers `catchret` and `cleanupret` instructions to pseudo `catchret` and `cleanupret` instructions in isel, which will be replaced with other instructions in `WebAssemblyExceptionPrepare` pass. 4. Adds 'WebAssemblyExceptionPrepare` pass, which is for running various transformation for EH. Currently this pass only replaces `catchret` and `cleanupret` instructions into appropriate wasm instructions to make this patch successfully run until the end. Currently this does not handle lowering of intrinsics related to LSDA info generation (`wasm.landingpad.index` and `wasm.lsda`), because they cannot be tested without implementing `EHStreamer`'s wasm-specific handlers. They are marked as TODO, which is needed to make isel pass. Also this does not generate `try` and `end_try` markers yet, which will be handled in later patches. This patch is based on the first wasm EH proposal. (https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md) Reviewers: dschuff, majnemer Subscribers: jfb, sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D44090 llvm-svn: 333705
* [WebAssembly] Add Wasm exception handling prepare passHeejin Ahn2018-05-311-0/+317
| | | | | | | | | | | | | | | | Summary: This adds a pass that transforms a program to be prepared for Wasm exception handling. This is using Windows EH instructions and based on the previous Wasm EH proposal. (https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md) Reviewers: dschuff, majnemer Subscribers: jfb, mgorny, sbc100, jgravelle-google, JDevlieghere, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D43746 llvm-svn: 333696
* [WebAssembly] Fix fast-isel lowering illegal argument and return types.Dan Gohman2018-05-222-0/+45
| | | | | | | | | | For both argument and return types, promote illegal types like i24 to i32, and if a type can't be easily promoted, clear out the signature before bailing out, so avoid leaving it in a partially complete state. Fixes PR37546. llvm-svn: 332947
* [WebAsembly] Update default triple in test files to wasm32-unknown-unkown.Sam Clegg2018-05-1084-87/+87
| | | | | | | | | | Summary: The final -wasm component has been the default for some time now. Subscribers: jfb, dschuff, jgravelle-google, eraman, aheejin, JDevlieghere, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D46342 llvm-svn: 332007
* [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label.Shiva Chen2018-05-092-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
* [DAGCombiner] Fix a case of 1 in non-splat vector pow2 divisorHeejin Ahn2018-04-271-0/+22
| | | | | | | | | | | | | | | | | | | | | | | | | Summary: D42479 (rL329525) enabled SDIV combine for pow2 non-splat vector dividers. But when there is a 1 in a vector, the instruction sequence to be generated involves shifting a value by the number of its bit widths, which is undefined (https://github.com/llvm-mirror/llvm/blob/c64f4dbfe31e509f9c1092b951e524b056245af8/lib/CodeGen/SelectionDAG/DAGCombiner.cpp#L6000-L6006). Especially, in architectures that do not support vector instructions, each of element in a vector will be computed separately using scalar operations, and then the resulting value will be undef for '1' values in a vector. (All 1's vector is fine; only vectors mixed with 1 and others will be affected.) Reviewers: RKSimon, jgravelle-google Subscribers: jfb, dschuff, sbc100, jgravelle-google, llvm-commits Differential Revision: https://reviews.llvm.org/D46161 llvm-svn: 331092
* [WebAssembly] Teach fast-isel to gracefully recover from illegal return types.Dan Gohman2018-04-171-0/+16
| | | | | | Fixes PR36564. llvm-svn: 330215
* [WebAssembly] Allow for the creation of user-defined custom sectionsSam Clegg2018-04-051-0/+20
| | | | | | | | | | | | | This patch adds a way for users to create their own custom sections to be added to wasm files. At the LLVM IR layer, they are defined through the "wasm.custom_sections" named metadata. The expected use case for this is bindings generators such as wasm-bindgen. Patch by Dan Gohman Differential Revision: https://reviews.llvm.org/D45297 llvm-svn: 329315
* [WebAssembly] Strip threadlocal attribute from globals in single thread modeDerek Schuff2018-03-201-0/+17
| | | | | | | | | The default thread model for wasm is single, and in this mode thread-local global variables can be lowered identically to non-thread-local variables. Differential Revision: https://reviews.llvm.org/D44703 llvm-svn: 328049
* [WebAssembly] Add mechanisms for specifying an explicit import module name.Dan Gohman2018-02-091-0/+19
| | | | | | | | | | | | | | | | | | | | This adds a wasm-import-module function attribute and a .import_module assembler directive, for specifying module import names for WebAssembly. Currently these may only be used for function symbols; global variables may be considered in the future. WebAssembly has a two-level namespace scheme for symbols, and it's normally the linker's job to assign the module name, which is the first-level name. The attributes here allow users to specify their own module names explicitly, which is useful for tools generating bindings to modules defined in other languages. This feature is not fully usable yet. It will evolve along with the ongoing symbol table and lld changes. Differential Revision: https://reviews.llvm.org/D42520 llvm-svn: 324778
* [WebAssembly] Fix test expectations after r324274Derek Schuff2018-02-062-80/+33
| | | | | | | Wasm uses the expand action for several FP compare ops, and that behavior changed. llvm-svn: 324305
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