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added support for fast approximate rsqrt(double). Provide 16 digit accurancy but is over 3x faster than 1/sqrt(double)

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Evghenii
2014-02-04 14:44:54 +01:00
parent b0753dc93d
commit eb1a495a7a
5 changed files with 48 additions and 24 deletions
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22
builtins/util.m4
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@@ -4533,31 +4533,29 @@ define_down_avgs()
')
define(`rsqrt_double', `
define double @__rsqrt_uniform_double(double) nounwind alwaysinline readnone
declare double @__rsqrt_safe_uniform_double___und(double, <WIDTH x MASK>)
define double @__rsqrt_uniform_double(double, <WIDTH x MASK>) nounwind alwaysinline readnone
{
%flt = fptrunc double %0 to float
%res = call float @__rsqrt_uniform_float(float %flt)
%dres = fpext float %res to double
ret double %dres
%res = call double @__rsqrt_safe_uniform_double___und(double %0, <WIDTH x MASK> %1)
ret double %res
}
define <WIDTH x double> @__rsqrt_varying_double(<WIDTH x double>) nounwind alwaysinline readnone
declare <WIDTH x double> @__rsqrt_safe_varying_double___vyd(<WIDTH x double>, <WIDTH x MASK>)
define <WIDTH x double> @__rsqrt_varying_double(<WIDTH x double>, <WIDTH x MASK>) nounwind alwaysinline readnone
{
%flt = fptrunc <WIDTH x double> %0 to <WIDTH x float>
%res = call <WIDTH x float> @__rsqrt_varying_float(<WIDTH x float> %flt)
%dres = fpext <WIDTH x float> %res to <WIDTH x double>
ret <WIDTH x double> %dres
%res = call <WIDTH x double> @__rsqrt_safe_varying_double___vyd(<WIDTH x double> %0, <WIDTH x MASK> %1)
ret <WIDTH x double> %res
}
')
define(`rcp_double', `
define double @__rcp_uniform_double(double) nounwind alwaysinline readnone
define double @__rcp_uniform_double(double, <WIDTH x MASK>) nounwind alwaysinline readnone
{
%flt = fptrunc double %0 to float
%res = call float @__rcp_uniform_float(float %flt)
%dres = fpext float %res to double
ret double %dres
}
define <WIDTH x double> @__rcp_varying_double(<WIDTH x double>) nounwind alwaysinline readnone
define <WIDTH x double> @__rcp_varying_double(<WIDTH x double>, <WIDTH x MASK>) nounwind alwaysinline readnone
{
%flt = fptrunc <WIDTH x double> %0 to <WIDTH x float>
%res = call <WIDTH x float> @__rcp_varying_float(<WIDTH x float> %flt)