https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91970
Thiago Jung Bauermann <thiago.bauermann at linaro dot org> changed:
What |Removed |Added
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CC| |thiago.bauermann at linaro dot
org
--- Comment #14 from Thiago Jung Bauermann <thiago.bauermann at linaro dot org>
---
This came up in the context of a Linux kernel patch series providing a "Unified
cross-architecture kernel-mode FPU API" because the AMD GPU driver fails to
build on arm with the series applied because of this issue:
https://lore.kernel.org/linux-arm-kernel/75a37a4b-f516-40a3-b6b5-4aa1636f9...@sifive.com/
Copying the patch author's response here:
> In both cases, the issue is that the toolchain requires runtime support to
> convert between `unsigned long long` and `double`, even when hardware FP is
> enabled. There was some past discussion about GCC inlining some of these
> conversions[1], but that did not get implemented.
>
> The short-term fix would be to drop the `select ARCH_HAS_KERNEL_FPU_SUPPORT`
> for 32-bit arm until we can provide these runtime library functions.
