From: Segher Boessenkool Date: Tue, 18 Oct 2016 08:00:00 +0000 (+0200) Subject: rs6000: Fix separate shrink-wrapping for TARGET_MULTIPLE X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8f784f6bde1ff14f73bc8337e5f250209a6831d8;p=gcc.git rs6000: Fix separate shrink-wrapping for TARGET_MULTIPLE We cannot use {SAVE,REST}_MULTIPLE and separate shrink-wrapping together, not without checking when actually emitting the prologue/epilogue that the registers to save/restore are actually still one contiguous block up to (and including) 31. So either: 1) We delay the decision of whether to use lmw/stmw to later; 2) We disallow shrink-wrapping separate (integer) components when those strategies are selected; or 3) We don't use those strategies if we use separate shrink-wrapping. This patch does 3). In the long term it may be best to do 1) instead, it can be slightly more efficient. This caused problems on darwin (it is the only config that uses lmw/stmw instructions by default). * config/rs6000/rs6000.c (rs6000_savres_strategy): Do not select {SAVE,REST}_MULTIPLE if shrink-wrapping separate components. (rs6000_get_separate_components): Assert we do not have those strategies selected. From-SVN: r241297 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 77fef062355..9e986643c56 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2016-10-18 Segher Boessenkool + + * config/rs6000/rs6000.c (rs6000_savres_strategy): Do not select + {SAVE,REST}_MULTIPLE if shrink-wrapping separate components. + (rs6000_get_separate_components): Assert we do not have those + strategies selected. + 2016-10-18 Richard Biener * tree-ssa-propagate.h (substitute_and_fold): Adjust prototype. diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 27611876b4f..2406d5c64b0 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -25518,7 +25518,10 @@ rs6000_savres_strategy (rs6000_stack_t *info, if (TARGET_MULTIPLE && !TARGET_POWERPC64 && !(TARGET_SPE_ABI && info->spe_64bit_regs_used) - && info->first_gp_reg_save < 31) + && info->first_gp_reg_save < 31 + && !(flag_shrink_wrap + && flag_shrink_wrap_separate + && optimize_function_for_speed_p (cfun))) { /* Prefer store multiple for saves over out-of-line routines, since the store-multiple instruction will always be smaller. */ @@ -27452,6 +27455,9 @@ rs6000_get_separate_components (void) sbitmap components = sbitmap_alloc (32); bitmap_clear (components); + gcc_assert (!(info->savres_strategy & SAVE_MULTIPLE) + && !(info->savres_strategy & REST_MULTIPLE)); + /* The GPRs we need saved to the frame. */ if ((info->savres_strategy & SAVE_INLINE_GPRS) && (info->savres_strategy & REST_INLINE_GPRS))