| commit | 74275a11038c0c354a31b5da4657e5ddfad58d9a | [log] [tgz] |
|---|---|---|
| author | Kito Cheng <kito.cheng@sifive.com> | Wed Sep 03 09:28:35 2025 +0800 |
| committer | GitHub <noreply@github.com> | Wed Sep 03 09:28:35 2025 +0800 |
| tree | c95c5cf8c0537649ef70f41bb399d8aa102af742 | |
| parent | c5d766236d2b550c093fe9d963f8d036b0fcfb0b [diff] |
[RISCV] Simplify code gen for riscv_vector_builtin_cg.inc [NFC] (#156397)
For each intrinsic with ManualCodegen block will generate something like
below:
```cpp
SegInstSEW = 0;
...
if (SegInstSEW == (unsigned)-1) {
auto PointeeType = E->getArg(4294967295)->getType()->getPointeeType();
SegInstSEW = llvm::Log2_64(getContext().getTypeSize(PointeeType));
}
```
But actually SegInstSEW is table-gen-time constant, so can remove that
if-check and directly use the constant.
This change reduce riscv_vector_builtin_cg.inc around 6600 lines (30913
to 24305) which is around 20% reduction, however seems this isn't impact
the build time much since the redundant dead branch is almost will
optimized away by compiler in early stage.
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