| commit | 2476e2a91140b57ca3ad0792597be4f4d20ddb1a | [log] [tgz] |
|---|---|---|
| author | Min-Yih Hsu <min@myhsu.dev> | Tue Dec 26 16:29:02 2023 -0800 |
| committer | Min-Yih Hsu <min@myhsu.dev> | Tue Dec 26 20:55:23 2023 -0800 |
| tree | b6b8bdbac5138128efe87d5f69f01cb80696c096 | |
| parent | 6f85075ff7281be1802c9fd30758d34b67481a1e [diff] |
[M68k] Optimize for overflow arithmetics that will never overflow
We lower overflow arithmetics to its M68kISD counterparts that produce
results of {i16/i32, i8} in which the second resut represents CCR. In
the event where we're certain there won't be an overflow, for instance
8 & 16-bit multiplications, we simply use zero in replacement of the
second result.
This patch replaces M68kISD::CMOV that takes this kind of zero or
all-ones CCR as condition value with its corresponding operand value.
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