[Bug gas/3159] New: generated code mismatches between 2.15 and 2.16

[michaelryan at mindspring dot com]

I discovered the second example when trying to correct for the first.

This small program:
.intel_syntax noprefix
.altmacro
            .text
            .global testa
.macro      zzz a
            add rax,OFFSET \a+8
            sub rax,OFFSET \a+8
.endm
 
.macro      yyy a
            local q
.equ q, (\a+8)
            lea rax,[rax+(\a+8)]
            lea rax,[rax-q]
.endm
 
            .data
            .align 16,0
.equ d, .
            .byte 0,0,0,0,0,0,0
            .byte 0,0,0,0,0,0,0
.equ c, .-d
 
.equ b, 14
 
            .text
            .align 16,0
testa:      push    rbp
            mov     rbp,rsp
 
 
           add     rax,OFFSET b+c+8
 
           zzz     b+c
 
           lea     rax,[rax-3]
           yyy     b+c
 
            leave
            ret
           .end

generates different code on 2.16 than on 2.15.

In 2.15:

32 0004 48052400                 add     rax,OFFSET b+c+8 
32      0000

In 2.16:
32 0004 48030425                 add     rax,OFFSET b+c+8 
32      24000000 

The 2.16 object code causes a segfault.


in 2.15:

  37 001a 488D8024      > lea rax,[rax+(b+c+8)]
  37      000000
  37 0021 488D80DC      > lea rax,[rax-.LL0001]
  37      FFFFFF

in 2.16:
  37                               yyy     b+c
  37                    > 
  37                    > .equ .LL0001,(b+c+8)
  37 0020 488D4016      > lea rax,[rax+(b+c+8)]
  37 0024 488D80EA      > lea rax,[rax-.LL0001]
  37      FFFFFF

-- 
           Summary: generated code mismatches between 2.15 and 2.16
           Product: binutils
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: michaelryan at mindspring dot com
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=3159

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