rs6000: Don't ICE when compiling the __builtin_vec_xst_trunc built-in [PR109178]

When we expand the __builtin_vec_xst_trunc built-in, we use the wrong mode
for the MEM operand which causes an unrecognizable insn ICE.  The solution
is to use the correct TMODE mode.

2023-03-20  Peter Bergner  <bergner@linux.ibm.com>

gcc/
	PR target/109178
	* config/rs6000/rs6000-builtin.cc (stv_expand_builtin): Use tmode.

gcc/testsuite/
	PR target/109178
	* gcc.target/powerpc/pr109178.c: New test.

(cherry picked from commit fbd50e867e6a782c7b56c9727bf7e1e74dae4b94)

diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index 26b486a9e5d4c5b1124185b4126dab4be30c3ae1..d34f9b7dd00436fe8ecf702d123b120fb31d26f8 100644 (file)
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -2962,7 +2962,7 @@ stv_expand_builtin (insn_code icode, rtx *op,
 
       rtx addr;
       if (op[1] == const0_rtx)
-       addr = gen_rtx_MEM (Pmode, op[2]);
+       addr = gen_rtx_MEM (tmode, op[2]);
       else
        {
          op[1] = copy_to_mode_reg (Pmode, op[1]);

diff --git a/gcc/testsuite/gcc.target/powerpc/pr109178.c b/gcc/testsuite/gcc.target/powerpc/pr109178.c
new file mode 100644 (file)
index 0000000..0f6e2d6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr109178.c
@@ -0,0 +1,13 @@
+/* PR target/109178 */
+/* { dg-require-effective-target int128 } */
+/* { dg-options "-O2 -mdejagnu-cpu=power10" } */
+
+/* Verify we do not ICE on the following.  */
+
+typedef __attribute__ ((altivec (vector__))) signed __int128 v1ti_t;
+
+void
+foo (signed int *dst, v1ti_t src)
+{
+  __builtin_vec_xst_trunc(src, 0, dst);
+}