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When the two operands are Unordered (for instance if one of them is NaN), ucomisd sets ZF=1, PF=1, and CF=1. When the result is LessThan, it sets ZF=0, PF=0, and CF=1. However, jb[e]/setb[e] only checks that CF=1 [or ZF=1] which causes the result to be true for unordered operands. To fix this, change the operand swap condition for these two floating point comparison types: always rewrite x < y as y > x, and never rewrite x > y as y < x. Add a test to check the result of cltd, cled, cgtd, cged, ceqd, and cned with arguments that are LessThan, Equal, GreaterThan, and Unordered. Additionally, check three different implementations for equality testing: one that uses the result of ceqd directly, one that uses the result to control a conditional jump, and one that uses the result both as a value and for a conditional jump. For now, unordered equality tests are still broken so they are disabled. |
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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'.