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| author | Michael Forney <mforney@mforney.org> | 2021-07-06 21:31:34 -0700 |
|---|---|---|
| committer | Quentin Carbonneaux <quentin@c9x.me> | 2021-08-02 11:02:12 +0200 |
| commit | 2bbfcf61b38edfe3c347cd270380e5117454c0cf (patch) | |
| tree | c4279513fb8d3a9f1dac903753d210eb7d01779c | |
| parent | 0437e97a1bb126cfa1974dad7b5479fa4b407f46 (diff) | |
| download | roux-2bbfcf61b38edfe3c347cd270380e5117454c0cf.tar.gz | |
copy: consider identity element for more instructions
udiv %x, 1 == %x, and for each of sub, or, xor, sar, shr, and shl, <op> %x, 0 == %x.
| -rw-r--r-- | copy.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/copy.c b/copy.c index 053f319..593ce24 100644 --- a/copy.c +++ b/copy.c @@ -27,10 +27,16 @@ iscopy(Ins *i, Ref r, Fn *fn) case Ocopy: return 1; case Omul: - return iscon(i->arg[1], 1, fn); case Odiv: + case Oudiv: return iscon(i->arg[1], 1, fn); case Oadd: + case Osub: + case Oor: + case Oxor: + case Osar: + case Oshl: + case Oshr: return iscon(i->arg[1], 0, fn); default: break; |