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rtl-optimization/104498: Fix comparing symbol reference

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gcc/ChangeLog:

	PR rtl-optimization/104498
	* alias.cc (compare_base_symbol_refs): Correct distance computation
	when swapping x and y.
This commit is contained in:
Andre Vieira 2022-02-21 09:41:53 +00:00
parent e01530ec1e
commit d34cdec567
1 changed files with 4 additions and 2 deletions
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6
gcc/alias.cc
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@ -2195,6 +2195,7 @@ compare_base_symbol_refs (const_rtx x_base, const_rtx y_base,
tree x_decl = SYMBOL_REF_DECL (x_base);
tree y_decl = SYMBOL_REF_DECL (y_base);
bool binds_def = true;
bool swap = false;
if (XSTR (x_base, 0) == XSTR (y_base, 0))
return 1;
@ -2204,6 +2205,7 @@ compare_base_symbol_refs (const_rtx x_base, const_rtx y_base,
{
if (!x_decl)
{
swap = true;
std::swap (x_decl, y_decl);
std::swap (x_base, y_base);
}
@ -2238,8 +2240,8 @@ compare_base_symbol_refs (const_rtx x_base, const_rtx y_base,
if (SYMBOL_REF_BLOCK (x_base) != SYMBOL_REF_BLOCK (y_base))
return 0;
if (distance)
*distance += (SYMBOL_REF_BLOCK_OFFSET (y_base)
- SYMBOL_REF_BLOCK_OFFSET (x_base));
*distance += (swap ? -1 : 1) * (SYMBOL_REF_BLOCK_OFFSET (y_base)
- SYMBOL_REF_BLOCK_OFFSET (x_base));
return binds_def ? 1 : -1;
}
/* Either the symbols are equal (via aliasing) or they refer to