On Tue, 28 Jun 2005, Robert Dewar wrote: > are preserved. For instance on the IBM mainframe one might use signed > or unsigned operations to implement int operations. On the original > MIPS one might use trapping or non-trapping arithmetic (either would > be valid).
Does -ftrapv ever take advantage of trapping instructions where the hardware has them available? Does anyone make substantial use of -ftrapv in production (whether as a tool for detecting bugs, or as a security tool where the performance cost is acceptable)? Or is it still at the stage of being a tool which would be useful in principle for some purposes but still needs some work (including on optimizing checks to reduce the performance cost) to make it useful in practice? -- Joseph S. Myers http://www.srcf.ucam.org/~jsm28/gcc/ [EMAIL PROTECTED] (personal mail) [EMAIL PROTECTED] (CodeSourcery mail) [EMAIL PROTECTED] (Bugzilla assignments and CCs)
