https://sourceware.org/bugzilla/show_bug.cgi?id=31979
Bug ID: 31979
Summary: DW_LNE_set_discriminator emitted right before Special
Opcodes
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: blarsen at redhat dot com
Target Milestone: ---
Created attachment 15627
--> https://sourceware.org/bugzilla/attachment.cgi?id=15627&action=edit
small cpp code that reproduces the issue
When creating the linetable for the attached cpp file with the command line
`gcc -fPIC -Og -g`, gas generates the following instructions for the last entry
related to line 11:
[0x00000062] Set column to 18
[0x00000064] Extended opcode 4: set Discriminator to 1
[0x00000068] Special opcode 13: advance Address by 0 to 0x401133 and Line by
8 to 11 (view 4)
Setting the discriminator here is futile, since the DWARF 5 section 6.2.5.1
says that Special opcodes will always set the Discriminator to 0 and
immediately do a Copy, so the information is lost.
In cases where Discriminator is set, Gas shouldn't emit special opcodes.
There is another case with this exact pattern happening, for line 14.
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