===================================================================
@@ -220,10 +220,15 @@ DEF_TUNE (X86_TUNE_LCP_STALL, "lcp_stall
as "add mem, reg". */
DEF_TUNE (X86_TUNE_READ_MODIFY, "read_modify", ~(m_PENT | m_LAKEMONT | m_PPRO))
-/* X86_TUNE_USE_INCDEC: Enable use of inc/dec instructions. */
+/* X86_TUNE_USE_INCDEC: Enable use of inc/dec instructions.
+
+ Core2 and nehalem has stall of 7 cycles for partial flag register stalls.
+ Sandy bridge and Ivy bridge generate extra uop. On Haswell this extra uop
+ is output only when the values needs to be really merged, which is not
+ done by GCC generated code. */
DEF_TUNE (X86_TUNE_USE_INCDEC, "use_incdec",
- ~(m_P4_NOCONA | m_CORE_ALL | m_BONNELL | m_SILVERMONT | m_INTEL
- | m_KNL | m_KNM | m_GENERIC))
+ ~(m_P4_NOCONA | m_CORE2 | m_NEHALEM | m_SANDYBRIDGE
+ | m_BONNELL | m_SILVERMONT | m_INTEL | m_KNL | m_KNM | m_GENERIC))
/* X86_TUNE_INTEGER_DFMODE_MOVES: Enable if integer moves are preferred
for DFmode copies */