Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

On Fri, 23 Dec 2016, Yunqiang Su wrote: > > 3, kernel: the emulation when a float exception taken. > > The big problem is that Loongson use the same encode for (unfused) > madd.fmt to (fused) madd.fmt. We cannot trap this in kernel. Why is that a problem? Just add a setting like

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

> 在 2016年12月22日，23:31，Richard Sandiford 写道： > > Matthew Fortune writes: >> Sandra Loosemore writes: >>> On 12/21/2016 11:54 AM, Yunqiang Su wrote: By this patch, I add a build-time option `

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

> 在 2016年12月23日，10:47，Paul Hua 写道： > > On aarch64 target the result are 1.332268e-17. > On x86 with fma target the result are also 1.332268e-17. > > so, I don't think the Loongson's madd.fmt/msub.fmt is incorrect. OMG. Will this behavior make some app wrong working

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

On aarch64 target the result are 1.332268e-17. On x86 with fma target the result are also 1.332268e-17. so, I don't think the Loongson's madd.fmt/msub.fmt is incorrect. We should do something for usage of fused madd, the all things has been tested an fedora21 remix for loongson(1). 1, gcc：add

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

> 在 2016年12月23日，00:18，Richard Sandiford 写道： > > Yunqiang Su writes: >>> 在 2016年12月22日，23:48，Yunqiang Su 写道： >>> 在 2016年12月22日，23:31，Richard Sandiford 写道：

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

Yunqiang Su writes: >> 在 2016年12月22日，23:48，Yunqiang Su 写道： >> >>> >>> 在 2016年12月22日，23:31，Richard Sandiford >>> 写道： >>> >>> Matthew Fortune writes: Sandra Loosemore

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

> 在 2016年12月22日，23:48，Yunqiang Su 写道： > >> >> 在 2016年12月22日，23:31，Richard Sandiford 写道： >> >> Matthew Fortune writes: >>> Sandra Loosemore writes: On 12/21/2016 11:54 AM, Yunqiang

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

> 在 2016年12月22日，23:31，Richard Sandiford 写道： > > Matthew Fortune writes: >> Sandra Loosemore writes: >>> On 12/21/2016 11:54 AM, Yunqiang Su wrote: By this patch, I add a build-time option `

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

Matthew Fortune writes: > Sandra Loosemore writes: >> On 12/21/2016 11:54 AM, Yunqiang Su wrote: >> > By this patch, I add a build-time option ` --with-unfused-madd4=yes/no', >> > and runtime option -m(no-)unfused-madd4, >> > to disable

RE: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

Sandra Loosemore writes: > On 12/21/2016 11:54 AM, Yunqiang Su wrote: > > By this patch, I add a build-time option ` --with-unfused-madd4=yes/no', > > and runtime option -m(no-)unfused-madd4, > > to disable generate madd.fmt instructions. > > Your patch also needs a

Re: [Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

On 12/21/2016 11:54 AM, Yunqiang Su wrote: By this patch, I add a build-time option ` --with-unfused-madd4=yes/no’, and runtime option -m(no-)unfused-madd4, to disable generate madd.fmt instructions. Your patch also needs a documentation change so that the new command-line option is listed in

[Patch ,gcc/MIPS] add an build-time/runtime option to disable madd.fmt

By this patch, I add a build-time option ` --with-unfused-madd4=yes/no’, and runtime option -m(no-)unfused-madd4, to disable generate madd.fmt instructions. These 2 options is needed due to madd.fmt/msub.fmt on Loongson are broken, which may generate wrong calculator result. diff --git