rs6000: Enable REE pass by default

Add ree pass as a default pass for rs6000 target for
O2 and above.

2023-05-16  Ajit Kumar Agarwal  <aagarwa1@linux.ibm.com>

gcc/ChangeLog:

	* common/config/rs6000/rs6000-common.cc: Add REE pass as a
	default rs6000 target pass for O2 and above.
	* doc/invoke.texi: Document -free

diff --git a/gcc/common/config/rs6000/rs6000-common.cc b/gcc/common/config/rs6000/rs6000-common.cc
index 2140c442ba9140ab926ac8f0c46138aa53a31b29..968db2150280bd6726d1394bc1395fc91a57132c 100644 (file)
--- a/gcc/common/config/rs6000/rs6000-common.cc
+++ b/gcc/common/config/rs6000/rs6000-common.cc
@@ -34,6 +34,8 @@ static const struct default_options rs6000_option_optimization_table[] =
     { OPT_LEVELS_ALL, OPT_fsplit_wide_types_early, NULL, 1 },
     /* Enable -fsched-pressure for first pass instruction scheduling.  */
     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
+    /* Enable -free for zero extension and sign extension elimination.*/
+    { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
     /* Enable -munroll-only-small-loops with -funroll-loops to unroll small
        loops at -O2 and above by default.  */
     { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 },

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index b92b857602799326a24edb6c9349d9610cb90832..2c525762171b3ce0f010541e63cb1592c9497bba 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -12455,8 +12455,8 @@ Attempt to remove redundant extension instructions.  This is especially
 helpful for the x86-64 architecture, which implicitly zero-extends in 64-bit
 registers after writing to their lower 32-bit half.
 
-Enabled for Alpha, AArch64 and x86 at levels @option{-O2},
-@option{-O3}, @option{-Os}.
+Enabled for Alpha, AArch64, PowerPC, RISC-V, SPARC, h83000 and x86 at levels
+@option{-O2}, @option{-O3}, @option{-Os}.
 
 @opindex fno-lifetime-dse
 @opindex flifetime-dse