44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
2009-04-24 Vladimir Makarov <vmakarov@redhat.com>
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PR target/39856
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* reg-stack.c (subst_stack_regs_pat): Remove gcc_assert for note
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for clobber.
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--- gcc/reg-stack.c (revision 146648)
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+++ gcc/reg-stack.c (working copy)
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@@ -1371,21 +1371,23 @@ subst_stack_regs_pat (rtx insn, stack re
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if (pat != PATTERN (insn))
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{
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- /* The fix_truncdi_1 pattern wants to be able to allocate
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- its own scratch register. It does this by clobbering
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- an fp reg so that it is assured of an empty reg-stack
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- register. If the register is live, kill it now.
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- Remove the DEAD/UNUSED note so we don't try to kill it
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- later too. */
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+ /* The fix_truncdi_1 pattern wants to be able to
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+ allocate its own scratch register. It does this by
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+ clobbering an fp reg so that it is assured of an
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+ empty reg-stack register. If the register is live,
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+ kill it now. Remove the DEAD/UNUSED note so we
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+ don't try to kill it later too.
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+
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+ In reality the UNUSED note can be absent in some
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+ complicated cases when the register is reused for
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+ partially set variable. */
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if (note)
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emit_pop_insn (insn, regstack, *dest, EMIT_BEFORE);
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else
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- {
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- note = find_reg_note (insn, REG_UNUSED, *dest);
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- gcc_assert (note);
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- }
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- remove_note (insn, note);
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+ note = find_reg_note (insn, REG_UNUSED, *dest);
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+ if (note)
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+ remove_note (insn, note);
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replace_reg (dest, FIRST_STACK_REG + 1);
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}
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else
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