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Remarks from Quentin:
It is an important decision to use Bot
and not Top as the result of 'x / 0'.
By using Bot, we refuse to give a warrant
to the compiler that would allow meaningless
subsequent decisions. An example follows.
Clang, on my computer, will build a program
which prints "Ho" when fed the following C:
int main()
{ puts(1/0 ? "Hi" : "Ho"); }
On the other hand, a C compiler based on
QBE will build a program which crashes,
as one would expect.
See also
https://c9x.me/notes/2014-09-10.html
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| amd64 | ||
| arm64 | ||
| doc | ||
| minic | ||
| test | ||
| tools | ||
| .gitignore | ||
| .tag | ||
| alias.c | ||
| all.h | ||
| cfg.c | ||
| copy.c | ||
| fold.c | ||
| gas.c | ||
| LICENSE | ||
| live.c | ||
| load.c | ||
| main.c | ||
| Makefile | ||
| mem.c | ||
| ops.h | ||
| parse.c | ||
| README | ||
| rega.c | ||
| spill.c | ||
| ssa.c | ||
| util.c | ||
QBE - Backend Compiler http://c9x.me/compile/ doc/ Documentation. minic/ An example C frontend for QBE. tools/ Miscellaneous tools (testing). test/ Tests. amd64/ arm64/ Architecture-specific code. The LICENSE file applies to all files distributed. - Compilation Invoke GNU make in this directory to create the executable file obj/qbe. On some systems (BSD) you might have to use 'gmake' instead of 'make'.