https://gcc.gnu.org/g:7258b3c700907ddf947ab5e85478456783138ada
commit 7258b3c700907ddf947ab5e85478456783138ada
Author: Michael Meissner <meiss...@linux.ibm.com>
Date: Wed Apr 10 11:36:10 2024 -0400
Update ChangeLog.*
Diff:
---
gcc/ChangeLog.bugs | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/gcc/ChangeLog.bugs b/gcc/ChangeLog.bugs
index 56a8be15cb1..7aa77ab7504 100644
--- a/gcc/ChangeLog.bugs
+++ b/gcc/ChangeLog.bugs
@@ -1,3 +1,60 @@
+==================== Branch work164-bugs, patch #204 ====================
+
+PR target/112886, Add %S<n> to print_operand for vector pair support.
+
+In looking at support for load vector pair and store vector pair for the
+PowerPC in GCC, I noticed that we were missing a print_operand output modifier
+if you are dealing with vector pairs to print the 2nd register in the vector
+pair.
+
+If the instruction inside of the asm used the Altivec encoding, then we could
+use the %L<n> modifier:
+
+ __vector_pair *p, *q, *r;
+ // ...
+ __asm__ ("vaddudm %0,%1,%2\n\tvaddudm %L0,%L1,%L2"
+ : "=v" (*p)
+ : "v" (*q), "v" (*r));
+
+Likewise if we know the value to be in a tradiational FPR register, %L<n> will
+work for instructions that use the VSX encoding:
+
+ __vector_pair *p, *q, *r;
+ // ...
+ __asm__ ("xvadddp %x0,%x1,%x2\n\txvadddp %L0,%L1,%L2"
+ : "=f" (*p)
+ : "f" (*q), "f" (*r));
+
+But if have a value that is in a traditional Altivec register, and the
+instruction uses the VSX encoding, %L<n> will a value between 0 and 31, when it
+should give a value between 32 and 63.
+
+This patch adds %S<n> that acts like %x<n>, except that it adds 1 to the
+register number.
+
+This is version 2 of the patch. The only difference is I made the test case
+simpler to read.
+
+I have tested this on power10 and power9 little endian systems and on a power9
+big endian system. There were no regressions in the patch. Can I apply it to
+the trunk?
+
+It would be nice if I could apply it to the open branches. Can I backport it
+after a burn-in period?
+
+2024-04-10 Michael Meissner <meiss...@linux.ibm.com>
+
+gcc/
+
+ PR target/112886
+ * config/rs6000/rs6000.cc (print_operand): Add %S<n> output modifier.
+ * doc/md.texi (Modifiers): Mention %S can be used like %x.
+
+gcc/testsuite/
+
+ PR target/112886
+ * /gcc.target/powerpc/pr112886.c: New test.
+
==================== Branch work164-bugs, patch #203 ====================
Add power10 ori/oris and xori/xoris fusion support.
