===================================================================
@@ -6284,6 +6284,12 @@ ix86_option_override_internal (bool main_args_p,
opts->x_ix86_isa_flags
|= OPTION_MASK_ISA_LZCNT & ~opts->x_ix86_isa_flags_explicit;
+ /* Disable BMI, BMI2 and TBM instructions for -m16. */
+ if (TARGET_16BIT_P(opts->x_ix86_isa_flags))
+ opts->x_ix86_isa_flags
+ &= ~((OPTION_MASK_ISA_BMI | OPTION_MASK_ISA_BMI2 | OPTION_MASK_ISA_TBM)
+ & ~opts->x_ix86_isa_flags_explicit);
+
/* Validate -mpreferred-stack-boundary= value or default it to
PREFERRED_STACK_BOUNDARY_DEFAULT. */
ix86_preferred_stack_boundary = PREFERRED_STACK_BOUNDARY_DEFAULT;
===================================================================
@@ -0,0 +1,9 @@
+/* PR target/80569 */
+/* { dg-do assemble } */
+/* { dg-options "-O2 -m16 -march=haswell" } */
+
+void load_kernel(void *setup_addr)
+{
+ unsigned int seg = (unsigned int)setup_addr >> 4;
+ asm("movl %0, %%es" : : "r"(seg));
+}