[binutils-gdb] Modify altivec-regs.exp testcase for AIX

[Ulrich Weigand <uweigand@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=60204874f5a987b164f7f194d3f96729847fe329

commit 60204874f5a987b164f7f194d3f96729847fe329
Author: Aditya Vidyadhar Kamath <Aditya.Kamath1@ibm.com>
Date:   Mon Mar 6 01:31:34 2023 -0600

    Modify altivec-regs.exp testcase for AIX
    
    On AIX, the debugger cannot access vector registers before they
    are first used by the inferior.  Hence we change the test case
    such that some vector registers are accessed by the variable 'x' in AIX
    and other targets are not affected as a consequence of the same.

Diff:
---
 gdb/testsuite/gdb.arch/altivec-regs.c   | 8 +++++++-
 gdb/testsuite/gdb.arch/altivec-regs.exp | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.arch/altivec-regs.c b/gdb/testsuite/gdb.arch/altivec-regs.c
index 8f3b729fe3f..1411f15e358 100644
--- a/gdb/testsuite/gdb.arch/altivec-regs.c
+++ b/gdb/testsuite/gdb.arch/altivec-regs.c
@@ -20,12 +20,18 @@ main ()
   vector unsigned int z; 
   int a;
 
+  #ifdef _AIX
+  /* On AIX, the debugger cannot access vector registers before they
+     are first used by the inferior.  Perform such an access here.  */
+  x = ((vector unsigned int) vec_splat_u8 (0));
+  #endif
+
   /* This line may look unnecessary but we do need it, because we want to
      have a line to do a next over (so that gdb refetches the registers)
      and we don't want the code to change any vector registers.
      The splat operations below modify the VRs,i
      so we don't want to execute them yet.  */
-  a = 9;
+  a = 9; /* start here */
   x = ((vector unsigned int) vec_splat_u8 (-2));
   y = ((vector unsigned int) vec_splat_u8 (1));
 	
diff --git a/gdb/testsuite/gdb.arch/altivec-regs.exp b/gdb/testsuite/gdb.arch/altivec-regs.exp
index 6cc32aeff22..b771a4df76f 100644
--- a/gdb/testsuite/gdb.arch/altivec-regs.exp
+++ b/gdb/testsuite/gdb.arch/altivec-regs.exp
@@ -52,6 +52,9 @@ if {![runto_main]} {
     return 0
 }
 
+gdb_breakpoint [gdb_get_line_number "start here"]
+gdb_continue_to_breakpoint "start here"
+
 gdb_test "set print frame-arguments all"
 
 # set all the registers integer portions to 1