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* cse.c (cse_insn): Don't change the result register of a libcall.

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From-SVN: r25898
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J"orn Rennecke 1999-03-22 13:55:22 +00:00 committed by Joern Rennecke
parent ce9d4c6d80
commit 50270076bd
2 changed files with 11 additions and 2 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Mon Mar 22 21:51:57 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* cse.c (cse_insn): Don't change the result register of a libcall.
Mon Mar 22 21:08:59 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* rtl.h (shallow_copy_rtx): Declare.

9
gcc/cse.c
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@ -7802,7 +7802,11 @@ cse_insn (insn, libcall_insn)
then be used in the sequel and we may be changing a two-operand insn
into a three-operand insn.
Also do not do this if we are operating on a copy of INSN. */
Also do not do this if we are operating on a copy of INSN.
Also don't do this if INSN ends a libcall; this would cause an unrelated
register to be set in the middle of a libcall, and we then get bad code
if the libcall is deleted. */
if (n_sets == 1 && sets[0].rtl && GET_CODE (SET_DEST (sets[0].rtl)) == REG
&& NEXT_INSN (PREV_INSN (insn)) == insn
@ -7810,7 +7814,8 @@ cse_insn (insn, libcall_insn)
&& REGNO (SET_SRC (sets[0].rtl)) >= FIRST_PSEUDO_REGISTER
&& REGNO_QTY_VALID_P (REGNO (SET_SRC (sets[0].rtl)))
&& (qty_first_reg[reg_qty[REGNO (SET_SRC (sets[0].rtl))]]
== REGNO (SET_DEST (sets[0].rtl))))
== REGNO (SET_DEST (sets[0].rtl)))
&& ! find_reg_note (insn, REG_RETVAL, NULL_RTX))
{
rtx prev = PREV_INSN (insn);
while (prev && GET_CODE (prev) == NOTE)