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expr.c (expand_expr, [...]): Optimize a reference to an element in a constant string.

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* expr.c (expand_expr, case INDIRECT_REF): Optimize a reference
        to an element in a constant string.

From-SVN: r16195
This commit is contained in:
Jim Wilson 1997-10-26 20:33:27 +00:00 committed by Jeff Law
parent edaa4ee062
commit 7581a30fe2
2 changed files with 17 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Sun Oct 26 13:31:47 1997 Jim Wilson (wilson@cygnus.com)
* expr.c (expand_expr, case INDIRECT_REF): Optimize a reference
to an element in a constant string.
Sun Oct 26 11:41:49 1997 Jason Merrill <jason@yorick.cygnus.com> Sun Oct 26 11:41:49 1997 Jason Merrill <jason@yorick.cygnus.com>
* dwarf2out.c (output_call_frame_info): The CIE pointer is now a 32 * dwarf2out.c (output_call_frame_info): The CIE pointer is now a 32

12
gcc/expr.c
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@ -5406,6 +5406,18 @@ expand_expr (exp, target, tmode, modifier)
{ {
tree exp1 = TREE_OPERAND (exp, 0); tree exp1 = TREE_OPERAND (exp, 0);
tree exp2; tree exp2;
tree index;
tree string = string_constant (exp1, &index);
int i;
if (string
&& TREE_CODE (string) == STRING_CST
&& TREE_CODE (index) == INTEGER_CST
&& !TREE_INT_CST_HIGH (index)
&& (i = TREE_INT_CST_LOW (index)) < TREE_STRING_LENGTH (string)
&& GET_MODE_CLASS (mode) == MODE_INT
&& GET_MODE_SIZE (mode) == 1)
return GEN_INT (TREE_STRING_POINTER (string)[i]);
op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM); op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
op0 = memory_address (mode, op0); op0 = memory_address (mode, op0);