[PATCH v2] x86: Don't return hard register when LRA is in progress

[H.J. Lu via Gcc-patches]

Don't return hard register in ix86_gen_scratch_sse_rtx when LRA is in
progress to avoid ICE when there are no available hard registers for
LRA.

gcc/

        PR target/101504
        * config/i386/i386.c (ix86_gen_scratch_sse_rtx): Don't return
        hard register when LRA is in progress.

gcc/testsuite/

        PR target/101504
        * gcc.target/i386/pr101504.c: New test.
---
 gcc/config/i386/i386.c                   |  2 +-
 gcc/testsuite/gcc.target/i386/pr101504.c | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr101504.c

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index ff96134fb37..876a19f4c1f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -23180,7 +23180,7 @@ ix86_optab_supported_p (int op, machine_mode mode1, 
machine_mode,
 rtx
 ix86_gen_scratch_sse_rtx (machine_mode mode)
 {
-  if (TARGET_SSE)
+  if (TARGET_SSE && !lra_in_progress)
     return gen_rtx_REG (mode, (TARGET_64BIT
                               ? LAST_REX_SSE_REG
                               : LAST_SSE_REG));
diff --git a/gcc/testsuite/gcc.target/i386/pr101504.c 
b/gcc/testsuite/gcc.target/i386/pr101504.c
new file mode 100644
index 00000000000..2ad0405dd7b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr101504.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=skylake" } */
+
+typedef unsigned int __attribute__((__vector_size__ (32))) U;
+typedef unsigned char __attribute__((__vector_size__ (64))) V;
+
+V g;
+
+U
+foo (void)
+{
+  V v = __builtin_shufflevector (g, g,
+                                0, 1, 2, 0, 5, 1, 0, 1, 3, 2, 3, 0, 4, 3, 1, 2,
+                                2, 0, 4, 2, 3, 1, 1, 2, 3, 4, 1, 1, 0, 0, 5, 2,
+                                0, 3, 3, 3, 3, 4, 5, 0, 1, 5, 2, 1, 0, 1, 1, 2,
+                                3, 2, 0, 5, 4, 5, 1, 0, 1, 4, 4, 3, 4, 5, 2, 
0);
+  v ^= 255;
+  V w = v + g;
+  U u = ((union { V a; U b; }) w).b + ((union { V a; U b; }) w).b[1];
+  return u;
+}
+
+/* { dg-final { scan-assembler-not "\.byte\[ \t\]+-1\n" } } */
-- 
2.31.1