| Summary: | sin (x) / cos (x) is not always folded to tan (x) | ||
|---|---|---|---|
| Product: | gcc | Reporter: | Uroš Bizjak <ubizjak> |
| Component: | tree-optimization | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | enhancement | CC: | gabravier, gcc-bugs, ubizjak |
| Priority: | P3 | Keywords: | missed-optimization |
| Version: | 4.3.0 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | 2006-11-26 08:01:12 | |
| Bug Depends on: | 15459 | ||
| Bug Blocks: | |||
This comes down to a tree combiner really. |
This testcase shows the problem when compiled with -ffast-math: double test1(double x) { double y1, y2; y1 = sin(x); y2 = cos(x); return y1 / y2; } double test2(double x) { return sin(x) / cos(x); } gcc -O2 -ffast-math: _.099t.optimized: ;; Function test2 (test2) Analyzing Edge Insertions. test2 (x) { <bb 2>: return __builtin_tan (x) [tail call]; } ;; Function test1 (test1) Analyzing Edge Insertions. test1 (x) { <bb 2>: return sin (x) / cos (x); }