* [PATCH] Fold RHS when open-coding memcpy
@ 2016-06-10 11:41 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2016-06-10 11:41 UTC (permalink / raw)
To: gcc-patches
I noticed that we fail to fold the source to a constant if possible.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2016-06-10 Richard Biener <rguenther@suse.de>
* gimple-fold.c (gimple_fold_builtin_memory_op): Make sure
to fold the RHS to a constant if possible.
Index: gcc/gimple-fold.c
===================================================================
*** gcc/gimple-fold.c (revision 237286)
--- gcc/gimple-fold.c (working copy)
*************** gimple_fold_builtin_memory_op (gimple_st
*** 1020,1033 ****
gimple *new_stmt;
if (is_gimple_reg_type (TREE_TYPE (srcvar)))
{
! new_stmt = gimple_build_assign (NULL_TREE, srcvar);
! if (gimple_in_ssa_p (cfun))
! srcvar = make_ssa_name (TREE_TYPE (srcvar), new_stmt);
! else
! srcvar = create_tmp_reg (TREE_TYPE (srcvar));
! gimple_assign_set_lhs (new_stmt, srcvar);
! gimple_set_vuse (new_stmt, gimple_vuse (stmt));
! gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
}
new_stmt = gimple_build_assign (destvar, srcvar);
gimple_set_vuse (new_stmt, gimple_vuse (stmt));
--- 1020,1039 ----
gimple *new_stmt;
if (is_gimple_reg_type (TREE_TYPE (srcvar)))
{
! tree tem = fold_const_aggregate_ref (srcvar);
! if (tem)
! srcvar = tem;
! if (! is_gimple_min_invariant (srcvar))
! {
! new_stmt = gimple_build_assign (NULL_TREE, srcvar);
! if (gimple_in_ssa_p (cfun))
! srcvar = make_ssa_name (TREE_TYPE (srcvar), new_stmt);
! else
! srcvar = create_tmp_reg (TREE_TYPE (srcvar));
! gimple_assign_set_lhs (new_stmt, srcvar);
! gimple_set_vuse (new_stmt, gimple_vuse (stmt));
! gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
! }
}
new_stmt = gimple_build_assign (destvar, srcvar);
gimple_set_vuse (new_stmt, gimple_vuse (stmt));
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2016-06-10 11:41 [PATCH] Fold RHS when open-coding memcpy Richard Biener
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