https://bugs.llvm.org/show_bug.cgi?id=48665
Bug ID: 48665
Summary: [ConstantFold] llvm generate invalid assemble for type
conversion between __fp16 and char
Product: libraries
Version: 10.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: zhongyu...@tom.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, pengfei.w...@intel.com,
spatel+l...@rotateright.com
Created attachment 24352
--> https://bugs.llvm.org/attachment.cgi?id=24352&action=edit
clang test_x86.cpp -S -O2 -o test.s
base on the case test_x86.cpp attached and llvm10, compile on the x86 machine
with commands similar as: clang test_x86.cpp -S -O2 -o test.s
#define half __fp16
void host_expect(char * arrDst)
{
half arrSrc[8] = {(half)0xecee, (half)0xf330, (half)0x698a, (half)0x2583,
(half)0xb45d, (half)0xfc66, (half)0x3587, (half)0x2607};
for(int i = 0; i < 8; i++)
{
arrDst[i] = arrSrc[i];
}
}
we'll get an empty define of the function host_expect, which is unexpected.
.globl _Z11host_expectPc # -- Begin function _Z11host_expectPc
.p2align 4, 0x90
.type _Z11host_expectPc,@function
_Z11host_expectPc: # @_Z11host_expectPc
.cfi_startproc
# %bb.0: # %entry
retq
.Lfunc_end0:
.size _Z11host_expectPc, .Lfunc_end0-_Z11host_expectPc
.cfi_endproc
# -- End function
.ident "clang version 10.0.0
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