mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 12:43:36 +01:00
Mirror of https://github.com/RPCS3/llvm-mirror
ecad339479
----------------------------------------
define i32 @src(i32 %x, i32 %y) {
%0:
%r = uadd_sat i32 %x, %y
ret i32 %r
}
=>
define i32 @tgt(i32 %x, i32 %y) {
%0:
%t0 = sub nsw nuw i32 4294967295, %y
%t1 = umin i32 %x, %t0
%r = add nuw i32 %t1, %y
ret i32 %r
}
Transformation seems to be correct!
The alternative, naive, lowering could be the following,
although i don't think it's better,
thought it will likely be needed for sadd/ssub/*shl:
----------------------------------------
define i32 @src(i32 %x, i32 %y) {
%0:
%r = uadd_sat i32 %x, %y
ret i32 %r
}
=>
define i32 @tgt(i32 %x, i32 %y) {
%0:
%t0 = zext i32 %x to i33
%t1 = zext i32 %y to i33
%t2 = add nuw i33 %t0, %t1
%t3 = zext i32 4294967295 to i33
%t4 = umin i33 %t2, %t3
%r = trunc i33 %t4 to i32
ret i32 %r
}
Transformation seems to be correct!
|
||
|---|---|---|
| benchmarks | ||
| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| projects | ||
| resources | ||
| runtimes | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitattributes | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.