[gcc(refs/users/meissner/heads/dmf009)] PowerPC: Switch to dense math names for all MMA operations.

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:f5acc881863927beb2778af44f19a6f2aaff430f

commit f5acc881863927beb2778af44f19a6f2aaff430f
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Fri Feb 17 15:09:37 2023 -0500

    PowerPC: Switch to dense math names for all MMA operations.
    
    This patch changes the assembler instruction names for MMA instructions from
    the original name used in power10 to the new name when used with the dense math
    system.  I.e. xvf64gerpp becomes dmxvf64gerpp.  The assembler will emit the
    same bits for either spelling.
    
    The patches have been tested on the following platforms.  I added the patches
    for PR target/107299 that I submitted on November 2nd before doing the builds so
    that GCC would build on systems using IEEE 128-bit long double.
        *   https://gcc.gnu.org/pipermail/gcc-patches/2022-November/604834.html
    
    There were no regressions with doing bootstrap builds and running the regression
    tests:
    
        1)  Power10 LE using --with-cpu=power10 --with-long-double-format=ieee;
        2)  Power10 LE using --with-cpu=power10 --with-long-double-format=ibm;
        3)  Power9 LE using --with-cpu=power9 --with-long-double-format=ibm; and
        4)  Power8 BE using --with-cpu=power8 (both 32-bit & 64-bit tested).
    
    Can I check this patch into the GCC 13 master branch?
    
    2023-02-17   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/mma.md (vvi4i4i8_dm): New int attribute.
            (avvi4i4i8_dm): Likewise.
            (vvi4i4i2_dm): Likewise.
            (avvi4i4i2_dm): Likewise.
            (vvi4i4_dm): Likewise.
            (avvi4i4_dm): Likewise.
            (pvi4i2_dm): Likewise.
            (apvi4i2_dm): Likewise.
            (vvi4i4i4_dm): Likewise.
            (avvi4i4i4_dm): Likewise.
            (mma_<vv>): Add support for running on DMF systems, generating the dense
            math instruction and using the dense math accumulators.
            (mma_<avv>): Likewise.
            (mma_<pv>): Likewise.
            (mma_<apv>): Likewise.
            (mma_<vvi4i4i8>): Likewise.
            (mma_<avvi4i4i8>): Likewise.
            (mma_<vvi4i4i2>): Likewise.
            (mma_<avvi4i4i2>): Likewise.
            (mma_<vvi4i4>): Likewise.
            (mma_<avvi4i4): Likewise.
            (mma_<pvi4i2>): Likewise.
            (mma_<apvi4i2): Likewise.
            (mma_<vvi4i4i4>): Likewise.
            (mma_<avvi4i4i4>): Likewise.
    
    gcc/testsuite/
    
            * gcc.target/powerpc/dm-double-test.c: New test.
            * lib/target-supports.exp (check_effective_target_ppc_dmr_ok): New
            target test.

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 8502215fed7..3e688ad7d79 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -6585,8 +6585,8 @@ proc check_effective_target_power10_ok { } {
     }
 }
 
-# Return 1 if this is a PowerPC target supporting -mcpu=future which enables
-# the dense math operations.
+# Return 1 if this is a PowerPC target supporting -mcpu=future or -mdense-math
+# which enables the dense math operations.
 proc check_effective_target_powerpc_dense_math_ok { } {
 	return [check_no_compiler_messages_nocache powerpc_dense_math_ok assembly {
 		__vector_quad vq;