[Bug target/18665] [3.4/4.0 Regression] -ftrapv borks up simple integer arithmetic

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2004-11-28 00:34 -------
Here's the difference between what gcc 3.3.3 produces and what 
gcc 4.0.0 manages to make of it (first 3.3.3, second 4.0.0): 
 
16,18c16,20 
<       movl    -8(%rbp), %esi 
<       movl    -4(%rbp), %edi 
<       call    __subvsi3 
--- 
>       movl    -4(%rbp), %eax 
>       movslq  %eax,%rdi 
>       movl    -8(%rbp), %eax 
>       movslq  %eax,%rsi 
>       call    __subvdi3 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18665