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home:lafenghu
gcc43
nvl425806.patch
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File nvl425806.patch of Package gcc43
2008-04-22 Pat Haugen <pthaugen@us.ibm.com> * config/rs6000/rs6000.c (rs6000_register_move_cost): Increase cost of LR/CTR moves for Power6. Index: gcc/config/rs6000/rs6000.c =================================================================== --- gcc/config/rs6000/rs6000.c.orig 2009-11-20 13:51:43.000000000 +0100 +++ gcc/config/rs6000/rs6000.c 2009-11-20 13:51:47.000000000 +0100 @@ -21368,6 +21368,12 @@ rs6000_register_move_cost (enum machine_ else if (from == CR_REGS) return 4; + /* Power6 has slower LR/CTR moves so make them more expensive than + memory in order to bias spills to memory .*/ + else if (rs6000_cpu == PROCESSOR_POWER6 + && reg_classes_intersect_p (from, LINK_OR_CTR_REGS)) + return 6 * hard_regno_nregs[0][mode]; + else /* A move will cost one instruction per GPR moved. */ return 2 * hard_regno_nregs[0][mode];
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