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| author | Nathan Sidwell <nathan@acm.org> | 2015-08-11 12:34:06 +0000 |
|---|---|---|
| committer | Nathan Sidwell <nathan@gcc.gnu.org> | 2015-08-11 12:34:06 +0000 |
| commit | a6810021afdc4e05a44d7c56682eebe9452c359d (patch) | |
| tree | 975f335631ad9587ccc537fcc29be670766001e3 /gcc/tree-ssa-phiopt.c | |
| parent | 739a838e18d8ce5dfbaf3bc40b3b92fd6111a458 (diff) | |
| download | gcc-a6810021afdc4e05a44d7c56682eebe9452c359d.zip gcc-a6810021afdc4e05a44d7c56682eebe9452c359d.tar.gz gcc-a6810021afdc4e05a44d7c56682eebe9452c359d.tar.bz2 | |
tree-ssa-phiopt.c (minmax_replacement): Create new ssa name if we're not the only contributor to target phi.
* tree-ssa-phiopt.c (minmax_replacement): Create new ssa name if
we're not the only contributor to target phi.
testsuite/
* c-c++-common/dfp/operator-comma.c: Call init function.
* c-c++-common/dfp/convert-dfp-2.c: New test.
From-SVN: r226778
Diffstat (limited to 'gcc/tree-ssa-phiopt.c')
| -rw-r--r-- | gcc/tree-ssa-phiopt.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c index 633ccc7..d46ba62 100644 --- a/gcc/tree-ssa-phiopt.c +++ b/gcc/tree-ssa-phiopt.c @@ -1277,8 +1277,16 @@ minmax_replacement (basic_block cond_bb, basic_block middle_bb, gsi_move_before (&gsi_from, &gsi); } + /* Create an SSA var to hold the min/max result. If we're the only + things setting the target PHI, then we can clone the PHI + variable. Otherwise we must create a new one. */ + result = PHI_RESULT (phi); + if (EDGE_COUNT (gimple_bb (phi)->preds) == 2) + result = duplicate_ssa_name (result, NULL); + else + result = make_ssa_name (TREE_TYPE (result)); + /* Emit the statement to compute min/max. */ - result = duplicate_ssa_name (PHI_RESULT (phi), NULL); new_stmt = gimple_build_assign (result, minmax, arg0, arg1); gsi = gsi_last_bb (cond_bb); gsi_insert_before (&gsi, new_stmt, GSI_NEW_STMT); |