http://llvm.org/bugs/show_bug.cgi?id=15388
Bug ID: 15388
Summary: 32bit Linux, the assignment operator of vector value
cause FPU stack over-flow.
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10104
--> http://llvm.org/bugs/attachment.cgi?id=10104&action=edit
A bug test code
In 32bit Linux, asignment operator or pass argument for the vector type value
defined by ext_vector, may cause FPU register stack over-flow, thus some
following float operator get not correct result!
analyze the attached demo code(int 32bit Linux Box):
from the disassembled code, we found that clang generate asm code like
"movq mm0, [esp+4]" for char8/uchar8 asignment operator, but no "EMMS"
instruction to reset, so cause FPU register stack over-flow , if any float
operator was followed, maybe cause the float result not correct..
I have test this demo code by clang3.2 and clang3.3, can represent the bug..
Any fix or update of the bug, please tell me. I will very appreciate　for your
help.
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