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| author | Victor van den Elzen <victor.vde@gmail.com> | 2009-03-31 04:59:44 +0200 |
|---|---|---|
| committer | Victor van den Elzen <victor.vde@gmail.com> | 2010-07-24 22:00:12 +0200 |
| commit | ac732cb6a599836bf4c988e59ac6de4498758c72 (patch) | |
| tree | 9983e099a978cd40786f9529eb687a6d5a14d265 /nasm.h | |
| parent | 088d151130b427367766057feadd8351e03ee19b (diff) | |
| download | nasm-ac732cb6a599836bf4c988e59ac6de4498758c72.tar.gz nasm-ac732cb6a599836bf4c988e59ac6de4498758c72.tar.bz2 nasm-ac732cb6a599836bf4c988e59ac6de4498758c72.zip | |
Improve process_ea and introduce -OL
Two fixes:
1. Optimization of [bx+0xFFFF] etc
0xFFFF is an sbyte under 16-bit semantics,
so make sure to check it right.
2. Don't optimize displacements in -O0
Displacements that fit into an sbyte or
can be removed should *not* be optimized in -O0.
Implicit zero displacements are still optimized, e.g.:
[eax] -> 0 bit displacement, [ebp] -> 8 bit displacement.
However explicit displacements are not optimized:
[eax+0] -> 32 bit displacement, [ebp+0] -> 32 bit displacement.
Because #2 breaks compatibility with 0.98,
I introduced a new optimization level: -OL, legacy.
Diffstat (limited to 'nasm.h')
| -rw-r--r-- | nasm.h | 3 |
1 files changed, 2 insertions, 1 deletions
@@ -480,7 +480,8 @@ enum ea_flags { /* special EA flags */ EAF_TIMESTWO = 4, /* really do EAX*2 not EAX+EAX */ EAF_REL = 8, /* IP-relative addressing */ EAF_ABS = 16, /* non-IP-relative addressing */ - EAF_FSGS = 32 /* fs/gs segment override present */ + EAF_FSGS = 32, /* fs/gs segment override present */ + EAF_NO_OFFS = 64 /* no explicit offset in source */ }; enum eval_hint { /* values for `hinttype' */ |