[llvm-bugs] [Bug 33867] New: Minor code gen difference betwen debug and no-debug introduced by X86FixupBWInsts
llvm-bugs at lists.llvm.org
Thu Jul 20 17:26:34 PDT 2017
Bug ID: 33867
Summary: Minor code gen difference betwen debug and no-debug
introduced by X86FixupBWInsts
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: Wolfgang_Pieb at playstation.sony.com
CC: llvm-bugs at lists.llvm.org
Created attachment 18825
Randomly generated and reduced test source
The attached C++ source exhibits a minor difference in code gen when
compiled with -g vs. without it. Not particularly important, probably
caused by the presence of DBG_VALUE instructions.
Compile with -O2 -g and with -O2 and examine the difference of the
objdump -d outputs:
< 72: 0f b7 44 24 ec movzwl -0x14(%rsp),%eax
> 72: 66 8b 44 24 ec mov -0x14(%rsp),%ax
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