On Tue, 30 Jul 2024, Jakub Jelinek wrote:
> On Tue, Jul 30, 2024 at 03:43:25PM +0300, Alexander Monakov wrote: > > > > On Tue, 30 Jul 2024, Richard Biener wrote: > > > > > > Oh, and please add a small comment why we don't use XFmode here. > > > > > > Will do. > > > > > > /* Do not enable XFmode, there is padding in it and it suffers > > > from normalization upon load like SFmode and DFmode when > > > not using SSE. */ > > > > Is it really true? I have no evidence of FLDT performing normalization > > (as mentioned in PR 114659, if it did, there would be no way to spill/reload > > x87 registers). > > > > (the padding is not part of the 80-bit mode precision of XFmode, right?) > > It is part of the mode (which has 12 or 16 byte size). > Though, the condition in the caller of the target hook should already > return false before calling this hook for the XFmode/XCmode modes exactly > becayse the precision doesn't match size. Yes, thanks, that's why I raised the question in parenthesis. The claim about normalization still doesn't make sense to me. Alexander
