Currently we have 3 different independent tunes for gather
"use_gather,use_gather_2parts,use_gather_4parts",
similar for scatter, there're
"use_scatter,use_scatter_2parts,use_scatter_4parts"
The patch support 2 standardizing options to enable/disable
vectorization for all gather/scatter instructions. The options is
interpreted by driver to 3 tunes.
bootstrapped and regtested on x86_64-pc-linux-gnu.
Ok for trunk?
gcc/ChangeLog:
* config/i386/i386.h (DRIVER_SELF_SPECS): Add
GATHER_SCATTER_DRIVER_SELF_SPECS.
(GATHER_SCATTER_DRIVER_SELF_SPECS): New macro.
* config/i386/i386.opt (mgather): New option.
(mscatter): Ditto.
---
gcc/config/i386/i386.h | 12 +++++++++++-
gcc/config/i386/i386.opt | 8 ++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index ef342fcee9b..d9ac2c29bde 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -565,7 +565,17 @@ extern GTY(()) tree x86_mfence;
# define SUBTARGET_DRIVER_SELF_SPECS ""
#endif
-#define DRIVER_SELF_SPECS SUBTARGET_DRIVER_SELF_SPECS
+#ifndef GATHER_SCATTER_DRIVER_SELF_SPECS
+# define GATHER_SCATTER_DRIVER_SELF_SPECS \
+ "%{mno-gather:-mtune-ctrl=^use_gather_2parts,^use_gather_4parts,^use_gather}
\
+ %{mgather:-mtune-ctrl=use_gather_2parts,use_gather_4parts,use_gather} \
+
%{mno-scatter:-mtune-ctrl=^use_scatter_2parts,^use_scatter_4parts,^use_scatter}
\
+ %{mscatter:-mtune-ctrl=use_scatter_2parts,use_scatter_4parts,use_scatter}"
+#endif
+
+#define DRIVER_SELF_SPECS \
+ SUBTARGET_DRIVER_SELF_SPECS " " \
+ GATHER_SCATTER_DRIVER_SELF_SPECS
/* -march=native handling only makes sense with compiler running on
an x86 or x86_64 chip. If changing this condition, also change
diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt
index ddb7f110aa2..99948644a8d 100644
--- a/gcc/config/i386/i386.opt
+++ b/gcc/config/i386/i386.opt
@@ -424,6 +424,14 @@ mdaz-ftz
Target
Set the FTZ and DAZ Flags.
+mgather
+Target
+Enable vectorization for gather instruction.
+
+mscatter
+Target
+Enable vectorization for scatter instruction.
+
mpreferred-stack-boundary=
Target RejectNegative Joined UInteger Var(ix86_preferred_stack_boundary_arg)
Attempt to keep stack aligned to this power of 2.
--
2.31.1
