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| author | Andreas Krebbel <krebbel1@de.ibm.com> | 2009-06-23 12:10:06 +0000 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@gcc.gnu.org> | 2009-06-23 12:10:06 +0000 |
| commit | fef015a857bef16bfc6304fab250ad0195c4fb1a (patch) | |
| tree | 5b3dc81258ae8c58b8f741a5606cce8a4b23b663 /gcc/tree-ssa-math-opts.c | |
| parent | 792569a94a163072c0da7c5aaa53a3a31c649888 (diff) | |
| download | gcc-fef015a857bef16bfc6304fab250ad0195c4fb1a.zip gcc-fef015a857bef16bfc6304fab250ad0195c4fb1a.tar.gz gcc-fef015a857bef16bfc6304fab250ad0195c4fb1a.tar.bz2 | |
tree-ssa-math-opts.c (find_bswap): Increase the search depth in order to match bswaps with signed source operands.
2009-06-23 Andreas Krebbel <krebbel1@de.ibm.com>
* tree-ssa-math-opts.c (find_bswap): Increase the search depth in
order to match bswaps with signed source operands.
2009-06-23 Andreas Krebbel <krebbel1@de.ibm.com>
* gcc.dg/optimize-bswapsi-1.c: Add new bswap implementation.
* gcc.dg/optimize-bswapdi-1.c: Likewise.
From-SVN: r148848
Diffstat (limited to 'gcc/tree-ssa-math-opts.c')
| -rw-r--r-- | gcc/tree-ssa-math-opts.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c index 7e4e1bd..20ddbad 100644 --- a/gcc/tree-ssa-math-opts.c +++ b/gcc/tree-ssa-math-opts.c @@ -1125,9 +1125,14 @@ find_bswap (gimple stmt) struct symbolic_number n; tree source_expr; + /* The last parameter determines the depth search limit. It usually + correlates directly to the number of bytes to be touched. We + increase that number by one here in order to also cover signed -> + unsigned conversions of the src operand as can be seen in + libgcc. */ source_expr = find_bswap_1 (stmt, &n, TREE_INT_CST_LOW ( - TYPE_SIZE_UNIT (gimple_expr_type (stmt)))); + TYPE_SIZE_UNIT (gimple_expr_type (stmt))) + 1); if (!source_expr) return NULL_TREE; |