[Bug c++/81151] New: -Wmaybe-uninitialized in insn-emit.c

["marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81151

            Bug ID: 81151
           Summary: -Wmaybe-uninitialized in insn-emit.c
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

Created attachment 41596
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41596&action=edit
Test-case

Building current GCC with GCC 7.1 produces warning:

g++ insn-emit.ii -Wmaybe-uninitialized
insn-emit.c: In function ‘rtx_def* gen_roundv16sf2(rtx, rtx)’:
insn-emit.c:148125:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~
insn-emit.c: In function ‘rtx_def* gen_roundv8sf2(rtx, rtx)’:
insn-emit.c:148194:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~
insn-emit.c: In function ‘rtx_def* gen_roundv4sf2(rtx, rtx)’:
insn-emit.c:148263:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~
insn-emit.c: In function ‘rtx_def* gen_roundv8df2(rtx, rtx)’:
insn-emit.c:148332:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~
insn-emit.c: In function ‘rtx_def* gen_roundv4df2(rtx, rtx)’:
insn-emit.c:148401:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~
insn-emit.c: In function ‘rtx_def* gen_roundv2df2(rtx, rtx)’:
insn-emit.c:148470:14: warning: ‘operands[2]’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
     operand2 = operands[2];
     ~~~~~~~~~^~~~~~~~~~~~~