From aff2c2d3af3233dfb2d237341f2fd8612dc61391 Mon Sep 17 00:00:00 2001 From: Bernd Schmidt Date: Fri, 15 Sep 2000 15:35:03 +0000 Subject: [PATCH] Avoid copying libcall results directly to user variables. From-SVN: r36433 --- gcc/ChangeLog | 5 +++++ gcc/optabs.c | 8 ++++++++ 2 files changed, 13 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c80ffa859f3..6c1152a9a38 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-09-15 Bernd Schmidt + + * optabs.c (emit_libcall_block): If target is a user variable, + copy to a temporary first. + 2000-09-15 Richard Henderson * expmed.c (store_bit_field): Consider naturally aligned diff --git a/gcc/optabs.c b/gcc/optabs.c index f35300b04b4..136f17897ab 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -2756,8 +2756,14 @@ emit_libcall_block (insns, target, result, equiv) rtx result; rtx equiv; { + rtx final_dest = target; rtx prev, next, first, last, insn; + /* If this is a reg with REG_USERVAR_P set, then it could possibly turn + into a MEM later. Protect the libcall block from this change. */ + if (! REG_P (target) || REG_USERVAR_P (target)) + target = gen_reg_rtx (GET_MODE (target)); + /* look for any CALL_INSNs in this sequence, and attach a REG_EH_REGION reg note to indicate that this call cannot throw or execute a nonlocal goto. (Unless there is already a REG_EH_REGION note, in which case @@ -2833,6 +2839,8 @@ emit_libcall_block (insns, target, result, equiv) remove_note (last, find_reg_note (last, REG_EQUAL, NULL_RTX)); } + emit_move_insn (final_dest, target); + if (prev == 0) first = get_insns (); else -- 2.30.2