8269598: Regressions up to 5% on aarch64 seems due to JDK-8268858
Reviewed-by: kvn, dlong
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@ -2591,6 +2591,14 @@ uint Matcher::int_pressure_limit()
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// a high register pressure area of the code so that split_DEF can
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// generate DefinitionSpillCopy for the derived pointer.
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uint default_int_pressure_threshold = _NO_SPECIAL_REG32_mask.Size() - 1;
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if (!PreserveFramePointer) {
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// When PreserveFramePointer is off, frame pointer is allocatable,
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// but different from other SOC registers, it is excluded from
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// fatproj's mask because its save type is No-Save. Decrease 1 to
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// ensure high pressure at fatproj when PreserveFramePointer is off.
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// See check_pressure_at_fatproj().
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default_int_pressure_threshold--;
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}
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return (INTPRESSURE == -1) ? default_int_pressure_threshold : INTPRESSURE;
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}
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