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Zen tuning part 5: Disable buldozer dispatch scheduling

Message ID 20171008105849.GB94265@kam.mff.cuni.cz
State New
Headers show
Series Zen tuning part 5: Disable buldozer dispatch scheduling | expand

Commit Message

Jan Hubicka Oct. 8, 2017, 10:58 a.m. UTC 
Hi,
at the moment we do dispatch scheduling which is trying to optimize for Buldrozer's
decoder.  This does not make much sense as both decoders are significantly different.

Bootstrapped/regtested x86_64-linux, comitted.

Honza

	* i386.c (has_dispatch): Disable for Ryzen.
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Patch

Index: i386.c
===================================================================
--- i386.c	(revision 253513)
+++ i386.c	(working copy)
@@ -51798,8 +51801,9 @@  do_dispatch (rtx_insn *insn, int mode)
 static bool
 has_dispatch (rtx_insn *insn, int action)
 {
+  /* Current implementation of dispatch scheduler models buldozer only.  */
   if ((TARGET_BDVER1 || TARGET_BDVER2 || TARGET_BDVER3
-      || TARGET_BDVER4 || TARGET_ZNVER1) && flag_dispatch_scheduler)
+      || TARGET_BDVER4) && flag_dispatch_scheduler)
     switch (action)
       {
       default: