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[Bug ipa/65236] [5 Regression]: IPA ICF causes miscompilation in Chromium built with -Os

From: "hubicka at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
To: gcc-bugs at gcc dot gnu dot org
Date: Fri, 27 Feb 2015 22:15:09 +0000
Subject: [Bug ipa/65236] [5 Regression]: IPA ICF causes miscompilation in Chromium built with -Os
Auto-submitted: auto-generated
References: <bug-65236-4 at http dot gcc dot gnu dot org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65236

--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is the code generated for thunk:
_Z5test11A:                                                                     
.LFB12:                                                                         
        .cfi_startproc                                                          
        pushq   %rbx                                                            
        .cfi_def_cfa_offset 16                                                  
        .cfi_offset 3, -16                                                      
        movq    %rdi, %rbx                                                      
        subq    $16, %rsp                                                       
        .cfi_def_cfa_offset 32                                                  
        movq    %rsp, %rdi                                                      
        call    _Z5test21A                                                      
        movq    (%rsp), %rax                                                    
        movq    %rax, (%rbx)                                                    
        movq    8(%rsp), %rax                                                   
        movq    %rax, 8(%rbx)                                                   
        addq    $16, %rsp                                                       
        .cfi_def_cfa_offset 16                                                  
        movq    %rbx, %rax                                                      
        popq    %rbx                                                            
        .cfi_def_cfa_offset 8                                                   
        ret                                                                     

which is wrong; the extra copy should not exist.

References:
- [Bug ipa/65236] New: [5 Regression]: IPA ICF causes miscompilation in Chromium built with -Os
  - From: marxin at gcc dot gnu.org

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