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17 lines
584 B
C
17 lines
584 B
C
$NetBSD$
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--- gcc/fwprop.c.orig Fri Apr 2 19:54:46 2010
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+++ gcc/fwprop.c
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@@ -228,7 +228,10 @@ single_def_use_enter_block (struct dom_walk_data *walk
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process_uses (df_get_artificial_uses (bb_index), DF_REF_AT_TOP);
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process_defs (df_get_artificial_defs (bb_index), DF_REF_AT_TOP);
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- df_simulate_initialize_forwards (bb, local_lr);
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+
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+ /* We don't call df_simulate_initialize_forwards, as it may overestimate
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+ the live registers if there are unused artificial defs. We prefer
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+ liveness to be underestimated. */
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FOR_BB_INSNS (bb, insn)
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if (INSN_P (insn))
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