| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | [DAGCombiner][X86][AArch64] Generalize `A-(A&B)`->`A&(~B)` fold (PR44448) | Roman Lebedev | 2020-01-03 | 1 | -8/+4 |
| | | | | | | | | | | | | | | | | | | | | | | | | The fold 'A - (A & (B - 1))' -> 'A & (0 - B)' added in 8dab0a4a7d691f2704f1079538e0ef29548db159 is too specific. It should/can just be 'A - (A & B)' -> 'A & (~B)' Even if we don't manage to fold `~` into B, we have likely formed `ANDN` node. Also, this way there's less similar-but-duplicate folds. Name: X - (X & Y) -> X & (~Y) %o = and i32 %X, %Y %r = sub i32 %X, %o => %n = xor i32 %Y, -1 %r = and i32 %X, %n https://rise4fun.com/Alive/kOUl See https://bugs.llvm.org/show_bug.cgi?id=44448 https://reviews.llvm.org/D71499 | ||||
| * | [NFC][X86][AArch64] Add 'A - (A & B)' pattern tests (PR44448) | Roman Lebedev | 2020-01-03 | 1 | -0/+107 |
| The fold 'A - (A & (B - 1))' -> 'A & (0 - B)' added in 8dab0a4a7d691f2704f1079538e0ef29548db159 is too specific. It should just be 'A - (A & B)' -> 'A & (~B)' Name: X - (X & Y) -> X & (~Y) %o = and i32 %X, %Y %r = sub i32 %X, %o => %n = xor i32 %Y, -1 %r = and i32 %X, %n https://rise4fun.com/Alive/kOUl See https://bugs.llvm.org/show_bug.cgi?id=44448 https://reviews.llvm.org/D71499 | |||||
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index : bcm5719-llvm | |
| Project Ortega BCM5719 LLVM | Raptor Computing Systems |
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