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An Improved Quake C Compiler
2d4a054440
Do not assume that the destination is a temporary location,
as our peephole optimizer will break this. For example, the
following IR code (generated via from `x ^= gety()`):
(0) binst6 <- BITXOR x, call5
(0) x <- STORE_F binst6
after peephole optimization becomes:
(7) x <- BITXOR x, call5
Therefore we cannot assume that the output of the virtual
xor instruction can be utilized as a temporary value.
BITXOR becomes `(x | y) - (x & y)`, which would wrongly be
generated as:
x = x | y;
temp0 = x & y;
x = x - temp0;
While this particular case can be fixed by using temp0 first
and then x, the cross-product case would not be so simple.
Signed-off-by: Wolfgang Bumiller <wry.git@bumiller.com>
Fixes #190
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| doc | ||
| misc | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| algo.h | ||
| ast.cpp | ||
| ast.h | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| code.cpp | ||
| conout.cpp | ||
| exec.cpp | ||
| fold.cpp | ||
| fold.h | ||
| ftepp.cpp | ||
| gmqcc.h | ||
| gmqcc.ini.example | ||
| intrin.cpp | ||
| intrin.h | ||
| ir.cpp | ||
| ir.h | ||
| lexer.cpp | ||
| lexer.h | ||
| LICENSE | ||
| main.cpp | ||
| Makefile | ||
| opts.cpp | ||
| opts.def | ||
| parser.cpp | ||
| parser.h | ||
| README | ||
| stat.cpp | ||
| test.cpp | ||
| utf8.cpp | ||
| util.cpp | ||
An improved QuakeC compiler