Re: [PATCH] LoongArch: fix __builtin_bitreverse16 ICE on LA32R

[mengqinggang]

LGTM, thanks!


在 2026/9/9 10:02, Xi Ruoyao 写道:

gcc/

        * config/loongarch/loongarch.md (bitreverseqi2): Disable on
        LA32R.

gcc/testsuite/

        * gcc.target/loongarch/bitreverse-la32r.c: New test.
---

Bootstrapped and regtested on loongarch64-linux-gnu.  Ok for trunk?

  gcc/config/loongarch/loongarch.md                     | 2 +-
  gcc/testsuite/gcc.target/loongarch/bitreverse-la32r.c | 4 ++++
  2 files changed, 5 insertions(+), 1 deletion(-)
  create mode 100644 gcc/testsuite/gcc.target/loongarch/bitreverse-la32r.c

diff --git a/gcc/config/loongarch/loongarch.md 
b/gcc/config/loongarch/loongarch.md
index ecf1563270f..cccb0ed8612 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -4771,7 +4771,7 @@ (define_insn "bitreverseqi2"
  (define_expand "bitreversehi2"
    [(set (match_operand:HI 0 "register_operand" "=r")
        (bitreverse:HI (match_operand:HI 1 "register_operand" "r")))]
-  ""
+  "TARGET_64BIT || TARGET_32BIT_S"
    {
      rtx t = gen_reg_rtx (word_mode);

diff --git a/gcc/testsuite/gcc.target/loongarch/bitreverse-la32r.c b/gcc/testsuite/gcc.target/loongarch/bitreverse-la32r.c

new file mode 100644
index 00000000000..72180176d68
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/bitreverse-la32r.c
@@ -0,0 +1,4 @@
+/* Verify that bitreverse builtins do not ICE on LA32R.  */
+/* { dg-do compile } */
+/* { dg-options "-mabi=ilp32s -march=la32rv1.0" } */
+#include "la64/bitreverse.c"