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The upper bits of Or and Xor can be clean, too.
author
Christoph Mallon
<christoph.mallon@gmx.de>
Wed, 12 Nov 2008 14:26:25 +0000
(14:26 +0000)
committer
Christoph Mallon
<christoph.mallon@gmx.de>
Wed, 12 Nov 2008 14:26:25 +0000
(14:26 +0000)
[r23591]
ir/be/ia32/ia32_transform.c
patch
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diff --git
a/ir/be/ia32/ia32_transform.c
b/ir/be/ia32/ia32_transform.c
index
bfd6abe
..
6f5a3f3
100644
(file)
--- a/
ir/be/ia32/ia32_transform.c
+++ b/
ir/be/ia32/ia32_transform.c
@@
-2680,6
+2680,12
@@
static bool upper_bits_clean(ir_node *transformed_node, ir_mode *mode)
upper_bits_clean(get_irn_n(transformed_node, n_ia32_And_right), mode) ||
upper_bits_clean(get_irn_n(transformed_node, n_ia32_And_left), mode);
upper_bits_clean(get_irn_n(transformed_node, n_ia32_And_right), mode) ||
upper_bits_clean(get_irn_n(transformed_node, n_ia32_And_left), mode);
+ case iro_ia32_Or:
+ case iro_ia32_Xor:
+ return
+ upper_bits_clean(get_irn_n(transformed_node, n_ia32_binary_right), mode) &&
+ upper_bits_clean(get_irn_n(transformed_node, n_ia32_binary_left), mode);
+
case iro_ia32_Const:
case iro_ia32_Immediate: {
const ia32_immediate_attr_t *attr =
case iro_ia32_Const:
case iro_ia32_Immediate: {
const ia32_immediate_attr_t *attr =
@@
-2695,7
+2701,6
@@
static bool upper_bits_clean(ir_node *transformed_node, ir_mode *mode)
}
default:
}
default:
- /* TODO recurse on Or, Xor, ... if appropriate? */
return false;
}
}
return false;
}
}