https://bugs.llvm.org/show_bug.cgi?id=44394
Bug ID: 44394
Summary: clang-cl is generating call to non-existing lib
function for win32 with /fp:except option
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: zamazan...@tut.by
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
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).
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