[Bug bootstrap/69677] [6 Regression] bootstrap failed with --with-arch=corei7 --with-cpu=corei7

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69677

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
STV turns:

insn 21 19 23 4 (parallel [
            (set (reg:DI 102 [ val ])
                (and:DI (reg/v:DI 97 [ val ])
                    (mem/u:DI (plus:SI (mult:SI (reg/v:SI 96 [ mode ])
                                (const_int 8 [0x8]))
                            (symbol_ref:SI ("mode_mask_array") [flags 0x40] 
<var_decl 0xf517e160 mode_mask_array>)) [13 mode_mask_array S8 A64])))
            (clobber (reg:CC 17 flags))
        ]) /export/gnu/import/git/gcc-regression/gcc/gcc/simplify-rtx.c:134 332
{*anddi3_doubleword}
     (expr_list:REG_DEAD (reg/v:DI 97 [ val ])
        (expr_list:REG_DEAD (reg/v:SI 96 [ mode ])
            (expr_list:REG_UNUSED (reg:CC 17 flags)
                (nil)))))
(insn 23 21 24 4 (parallel [
            (set (reg:DI 103)
                (ashift:DI (const_int 1 [0x1])
                    (subreg:QI (reg:SI 91 [ _8 ]) 0)))
            (clobber (reg:CC 17 flags))
        ]) /export/gnu/import/git/gcc-regression/gcc/gcc/simplify-rtx.c:135 449
{*ashldi3_doubleword}
     (expr_list:REG_DEAD (reg:SI 91 [ _8 ])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))

into
(insn 47 19 21 4 (set (reg:DI 111)
        (mem/u:DI (plus:SI (mult:SI (reg/v:SI 96 [ mode ])
                    (const_int 8 [0x8]))
                (symbol_ref:SI ("mode_mask_array") [flags 0x40]  <var_decl
0xf517e160 mode_mask_array>)) [13 mode_mask_array S8 A64]))
/export/gnu/import/git/gcc-regression/gcc/gcc/simplify-rtx.c:134 -1
     (nil))
(insn 21 47 23 4 (set (subreg:V2DI (reg:DI 102 [ val ]) 0)
        (and:V2DI (subreg:V2DI (reg/v:DI 97 [ val ]) 0)
            (subreg:V2DI (reg:DI 111) 0)))
/export/gnu/import/git/gcc-regression/gcc/gcc/simplify-rtx.c:134 3253
{*andv2di3}
     (expr_list:REG_DEAD (reg/v:DI 97 [ val ])
        (expr_list:REG_DEAD (reg/v:SI 96 [ mode ])
            (expr_list:REG_UNUSED (reg:CC 17 flags)
                (nil)))))
(insn 23 21 45 4 (parallel [
            (set (reg:DI 103)
                (ashift:DI (const_int 1 [0x1])
                    (subreg:QI (reg:SI 91 [ _8 ]) 0)))
            (clobber (reg:CC 17 flags))
        ]) /export/gnu/import/git/gcc-regression/gcc/gcc/simplify-rtx.c:135 449
{*ashldi3_doubleword}
     (expr_list:REG_DEAD (reg:SI 91 [ _8 ])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))

So STV requires 16 byte stack alignment and uses 16 byte stack alignment.