3 Commits

Author	SHA1	Message	Date
Andrew Kelley	0d4b6ac741	add LTO support ... 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	2021-01-23 18:18:07 -07:00
Timon Kruiper	56c059077c	stage2: add initial impl of control flow in LLVM backend ... 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.	2021-01-08 19:30:52 +01:00
Timon Kruiper	b1cfa923be	stage2: rename and move files related to LLVM backend	2021-01-06 10:52:20 +01:00