[PATCH 2/2] validate_subreg before call gen_lowpart to avoid ICE.

[liuhongt via Gcc-patches]

gcc/ChangeLog:

        * expmed.c (extract_bit_field_using_extv): validate_subreg
        before call gen_lowpart.
---
 gcc/expmed.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/expmed.c b/gcc/expmed.c
index 3143f38e057..10d62d857a8 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -1571,12 +1571,16 @@ extract_bit_field_using_extv (const extraction_insn 
*extv, rtx op0,
 
   if (GET_MODE (target) != ext_mode)
     {
+      machine_mode tmode = GET_MODE (target);
       /* Don't use LHS paradoxical subreg if explicit truncation is needed
         between the mode of the extraction (word_mode) and the target
         mode.  Instead, create a temporary and use convert_move to set
         the target.  */
       if (REG_P (target)
-         && TRULY_NOOP_TRUNCATION_MODES_P (GET_MODE (target), ext_mode))
+         && TRULY_NOOP_TRUNCATION_MODES_P (tmode, ext_mode)
+         && validate_subreg (ext_mode, tmode,
+                             target,
+                             subreg_lowpart_offset (ext_mode, tmode)))
        {
          target = gen_lowpart (ext_mode, target);
          if (partial_subreg_p (GET_MODE (spec_target), ext_mode))
-- 
2.27.0