AntonYudintsev added a comment.
I have found bug in clang-cl (win32 clang), related to recent inroduction of
ffp-exception-behavior.
Unfortunately, I don't have a working patch yet, and since LLVM bugtracker
registration is closed, I can not even submit a bug.
So, if it is not a trouble for you, I will email the bug description here.
Please let me know if it isn't appropriate. Bug description:
============================================================
Windows: clang-cl is generating call to non-existing lib function for win32
with /fp:except option.
With recent ffp-exception-behavior=maytrap/strict, fp:except in clang-cl became
generate FPE aware code.
But in case of floorf and ceilf it generates call to non-existing library
function.
clang-cl.exe -m32 /Ox /fp:except testFloor.cpp /FA
testFloor.cpp:
#include <math.h>
float ret(float v) { return floorf(v); }
resulting assember:
push eax
movss xmm0, dword ptr [esp + 8]
movss dword ptr [esp], xmm0
call _floorf #no such function!!!
pop eax
ret
Expected behaviour:
there is no floorf lib function. Like with cosf and other math functions,
floorf in MSVC is implemented as inline function.
So, it should be call to _floor (with apropriate conversion first).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D62731/new/
https://reviews.llvm.org/D62731
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