https://llvm.org/bugs/show_bug.cgi?id=31708
Bug ID: 31708
Summary: signext of small integer return types ignored
Product: new-bugs
Version: 3.9
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: eric.schwe...@pgroup.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17873
--> https://llvm.org/bugs/attachment.cgi?id=17873&action=edit
Small test file to show x86 signext i16 returns
In the attached .ll file is a small function that has a return type of "signext
i16". From the LLVM Language Reference, it seems that the value returned ought
to be sign extended to the word width (i32) of the target in this case.
Experimentation showed that sign extension was the case in 3.8.
movswl -2(%rsp), %eax
However, in 3.9 the sign extension changed to a zero extension.
movzwl -2(%rsp), %eax
This zero extension can be seen in my latest "master" branch build as well.
To reproduce:
llc -O1 -o bug.s bug.ll
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