[PATCH] x86: Check invalid third argument to __builtin_ia32_prefetch

[H.J. Lu via Gcc-patches]

Check invalid third argument to __builtin_ia32_prefetch when expaning
__builtin_ia32_prefetch to avoid ICE later.

gcc/

        PR target/108436
        * config/i386/i386-expand.cc (ix86_expand_builtin): Check
        invalid third argument to __builtin_ia32_prefetch.

gcc/testsuite/

        * gcc.target/i386/pr108436.c: New test.
---
 gcc/config/i386/i386-expand.cc           | 12 ++++++++++++
 gcc/testsuite/gcc.target/i386/pr108436.c | 15 +++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr108436.c

diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index 54f700cd09d..e2e2d28bb47 100644
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -13175,6 +13175,12 @@ ix86_expand_builtin (tree exp, rtx target, rtx 
subtarget,
 
        if (INTVAL (op3) == 1)
          {
+           if (INTVAL (op2) < 2 || INTVAL (op2) > 3)
+             {
+               error ("invalid third argument");
+               return const0_rtx;
+             }
+
            if (TARGET_64BIT && TARGET_PREFETCHI
                && local_func_symbolic_operand (op0, GET_MODE (op0)))
              emit_insn (gen_prefetchi (op0, op2));
@@ -13195,6 +13201,12 @@ ix86_expand_builtin (tree exp, rtx target, rtx 
subtarget,
                op0 = copy_addr_to_reg (op0);
              }
 
+           if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
+             {
+               warning (0, "invalid third argument to 
%<__builtin_ia32_prefetch%>; using zero");
+               op2 = const0_rtx;
+             }
+
            if (TARGET_3DNOW || TARGET_PREFETCH_SSE
                || TARGET_PRFCHW || TARGET_PREFETCHWT1)
              emit_insn (gen_prefetch (op0, op1, op2));
diff --git a/gcc/testsuite/gcc.target/i386/pr108436.c 
b/gcc/testsuite/gcc.target/i386/pr108436.c
new file mode 100644
index 00000000000..d51f25863a5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr108436.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-mprefetchi" } */
+
+int
+foo (int a)
+{
+  return a + 1;
+}
+
+void
+bad (int *p)
+{
+  __builtin_ia32_prefetch (p, 0, 4, 0);   /* { dg-warning "invalid third 
argument to '__builtin_ia32_prefetch'; using zero" } */
+  __builtin_ia32_prefetch (foo, 0, 4, 1);   /* { dg-error "invalid third 
argument" } */
+}
-- 
2.39.0