Opened 6 years ago
Closed 6 years ago
#739 closed defect (fixed)
IA-64 FP possibly broken
| Reported by: | Jiří Zárevúcky | Owned by: | Jakub Jermář |
|---|---|---|---|
| Priority: | major | Milestone: | 0.8.0 |
| Component: | helenos/unspecified | Version: | mainline |
| Keywords: | Cc: | ||
| Blocker for: | Depends on: | ||
| See also: |
Description
libgcc for IA-64 uses floating-point instructions to implement 64b integer division and modulo. The unsigned modulo (see source) however gives incorrect results for large dividends.
Superficially, it seems as if the operand is interpreted as signed, returning the signed (negative) modulo result instead of the correct unsigned one, however I haven't confirmed this.
While this might be problem in the libgcc assembly, I'm more inclined to suspect that the problem lies in our FP support.
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Fixed in commit cc74cb5c5f69f9cd7b915a29908ded2daedb158d