mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-29 07:42:23 -05:00
d799c8a5f6
* gnu/packages/patches/fp16-implicit-double.patch: New file. * gnu/local.mk (dist_patch_DATA): Adjust accordingly. * gnu/packages/maths.scm (fp16)[source](patches): Add it.
23 lines
846 B
Diff
23 lines
846 B
Diff
Prevent implicit conversion of float to double to avoid precision
|
|
error on i686.
|
|
|
|
https://github.com/Maratyszcza/FP16/issues/20
|
|
|
|
Taken from Debian:
|
|
|
|
https://salsa.debian.org/deeplearning-team/fp16/-/blob/master/debian/patches/ftbfs-i386.patch
|
|
|
|
Index: fp16/include/fp16/fp16.h
|
|
===================================================================
|
|
--- fp16.orig/include/fp16/fp16.h
|
|
+++ fp16/include/fp16/fp16.h
|
|
@@ -228,7 +228,8 @@ static inline uint16_t fp16_ieee_from_fp
|
|
const float scale_to_inf = fp32_from_bits(UINT32_C(0x77800000));
|
|
const float scale_to_zero = fp32_from_bits(UINT32_C(0x08800000));
|
|
#endif
|
|
- float base = (fabsf(f) * scale_to_inf) * scale_to_zero;
|
|
+ const volatile float base_inf = fabsf(f) * scale_to_inf;
|
|
+ float base = base_inf * scale_to_zero;
|
|
|
|
const uint32_t w = fp32_to_bits(f);
|
|
const uint32_t shl1_w = w + w;
|