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
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error on i686.
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https://github.com/Maratyszcza/FP16/issues/20
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Taken from Debian:
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https://salsa.debian.org/deeplearning-team/fp16/-/blob/master/debian/patches/ftbfs-i386.patch
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Index: fp16/include/fp16/fp16.h
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===================================================================
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--- fp16.orig/include/fp16/fp16.h
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+++ fp16/include/fp16/fp16.h
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@@ -228,7 +228,8 @@ static inline uint16_t fp16_ieee_from_fp
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const float scale_to_inf = fp32_from_bits(UINT32_C(0x77800000));
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const float scale_to_zero = fp32_from_bits(UINT32_C(0x08800000));
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#endif
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- float base = (fabsf(f) * scale_to_inf) * scale_to_zero;
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+ const volatile float base_inf = fabsf(f) * scale_to_inf;
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+ float base = base_inf * scale_to_zero;
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const uint32_t w = fp32_to_bits(f);
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const uint32_t shl1_w = w + w;
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