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| author | Max Graey <maxgraey@gmail.com> | 2021-09-14 19:24:34 +0300 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-09-14 16:24:34 +0000 |
| commit | 9e2f13a2d14284cbc3e6dd4d5f891fa5df895436 (patch) | |
| tree | de0a114f1d3bf1affee5ff42b2a78fc5a803c19b /src/wasm/wasm-stack.cpp | |
| parent | 181b0e7037bc2999a24cb45a02523f3da04b254d (diff) | |
| download | binaryen-9e2f13a2d14284cbc3e6dd4d5f891fa5df895436.tar.gz binaryen-9e2f13a2d14284cbc3e6dd4d5f891fa5df895436.tar.bz2 binaryen-9e2f13a2d14284cbc3e6dd4d5f891fa5df895436.zip | |
[OptimizeInstructions] Optimize memory.fill with constant arguments (#4130)
This is reland of #3071
Do similar optimizations as in #3038 but for memory.fill.
`memory.fill(d, v, 0)` ==> `{ drop(d), drop(v) }` only with `ignoreImplicitTraps` or `trapsNeverHappen`
`memory.fill(d, v, 1)` ==> `store8(d, v)`
Further simplifications can be done only if v is constant because otherwise binary size would increase:
`memory.fill(d, C, 1)` ==> `store8(d, (C & 0xFF))`
`memory.fill(d, C, 2)` ==> `store16(d, (C & 0xFF) * 0x0101)`
`memory.fill(d, C, 4)` ==> `store32(d, (C & 0xFF) * 0x01010101)`
`memory.fill(d, C, 8)` ==> `store64(d, (C & 0xFF) * 0x0101010101010101)`
`memory.fill(d, C, 16)` ==> `store128(d, i8x16.splat(C & 0xFF))`
Diffstat (limited to 'src/wasm/wasm-stack.cpp')
0 files changed, 0 insertions, 0 deletions