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[2/4] Add a branch cost for SPARC T4.

Message ID 1495049778-20262-3-git-send-email-sheldon.lobo@oracle.com
State New
Headers show

Commit Message

Sheldon Lobo May 17, 2017, 7:36 p.m. UTC
* config/sparc/sparc.h (BRANCH_COST): Set the SPARC T4 branch
	latency to 2.
---
 gcc/config/sparc/sparc.h |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/gcc/config/sparc/sparc.h b/gcc/config/sparc/sparc.h
index 590a5f4..6277738 100644
--- a/gcc/config/sparc/sparc.h
+++ b/gcc/config/sparc/sparc.h
@@ -1566,7 +1566,9 @@  do {									   \
    and annulled branches insert 4 bubbles.
 
    On Niagara-2 and Niagara-3, a not-taken branch costs 1 cycle whereas
-   a taken branch costs 6 cycles.  */
+   a taken branch costs 6 cycles.
+
+   The T4 Supplement specifies the branch latency at 2 cycles. */
 
 #define BRANCH_COST(speed_p, predictable_p) \
 	((sparc_cpu == PROCESSOR_V9 \
@@ -1579,7 +1581,9 @@  do {									   \
 	 : ((sparc_cpu == PROCESSOR_NIAGARA2 \
 	     || sparc_cpu == PROCESSOR_NIAGARA3) \
 	    ? 5 \
-	 : 3))))
+	 : (sparc_cpu == PROCESSOR_NIAGARA4 \
+	    ? 2 \
+	 : 3)))))
 
 /* Control the assembler format that we output.  */