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Syncing with master branch because I want to re-run
update_clang_options.zig in the llvm12 branch.
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We can now codegen optionals! This includes the following instructions:
- is_null
- is_null_ptr
- is_non_null
- is_non_null_ptr
- optional_payload
- optional_payload_ptr
- br_void
Also includes a test for optionals.
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Conflicts:
* src/clang.zig
* src/llvm.zig
- this file got moved to src/llvm/bindings.zig in master branch so I
had to put the new LLVM arch/os enum tags into it.
* lib/std/target.zig, src/stage1/target.cpp
- haiku had an inconsistency with its default target ABI, gnu vs
eabi. In this commit we make it gnu in both places to match the
latest changes by @hoanga.
* src/translate_c.zig
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The CLI gains -flto and -fno-lto options to override the default.
However, the cool thing about this is that the defaults are great! In
general when you use build-exe in release mode, Zig will enable LTO if
it would work and it would help.
zig cc supports detecting and honoring the -flto and -fno-lto flags as
well. The linkWithLld functions are improved to all be the same with
regards to copying the artifact instead of trying to pass single objects
through LLD with -r. There is possibly a future improvement here as
well; see the respective TODOs.
stage1 is updated to support outputting LLVM bitcode instead of machine
code when lto is enabled. This allows LLVM to optimize across the Zig and
C/C++ code boundary.
closes #2845
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The following TZIR instrutions have been implemented in the backend:
- all cmp operators (lt, lte, gt, gte, eq, neq)
- block
- br
- condbr
The following LLVMIR is generated for a simple assert function:
```
define void @assert(i1 %0) {
Entry:
%1 = alloca i1, align 1
store i1 %0, i1* %1, align 1
%2 = load i1, i1* %1, align 1
%3 = xor i1 %2, true
br i1 %3, label %Then, label %Else
Then: ; preds = %Entry
call void @llvm.debugtrap()
unreachable
Else: ; preds = %Entry
br label %Block
Block: ; preds = %Else
ret void
}
```
See tests for more examples.
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