AARCH64_EXTRA_TUNING_OPTION ("rename_load_regs", RENAME_LOAD_REGS)
+AARCH64_EXTRA_TUNING_OPTION ("cse_sve_vl_constants", CSE_SVE_VL_CONSTANTS)
+
#undef AARCH64_EXTRA_TUNING_OPTION
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
- (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
+ (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS), /* tune_flags. */
&generic_prefetch_tune
};
*cost += rtx_cost (op0, mode, PLUS, 0, speed);
if (speed)
- /* ADD (immediate). */
- *cost += extra_cost->alu.arith;
+ {
+ /* ADD (immediate). */
+ *cost += extra_cost->alu.arith;
+
+ /* Some tunings prefer to not use the VL-based scalar ops.
+ Increase the cost of the poly immediate to prevent their
+ formation. */
+ if (GET_CODE (op1) == CONST_POLY_INT
+ && (aarch64_tune_params.extra_tuning_flags
+ & AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS))
+ *cost += COSTS_N_INSNS (1);
+ }
return true;
}
&& (!REG_P (op1)
|| !REGNO_PTR_FRAME_P (REGNO (op1))))
operands[2] = force_reg (<MODE>mode, operands[2]);
+ /* Some tunings prefer to avoid VL-based operations.
+ Split off the poly immediate here. The rtx costs hook will reject attempts
+ to combine them back. */
+ else if (GET_CODE (operands[2]) == CONST_POLY_INT
+ && can_create_pseudo_p ()
+ && (aarch64_tune_params.extra_tuning_flags
+ & AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS))
+ operands[2] = force_reg (<MODE>mode, operands[2]);
/* Expand polynomial additions now if the destination is the stack
pointer, since we don't want to use that as a temporary. */
else if (operands[0] == stack_pointer_rtx
--- /dev/null
+/* { dg-do compile } */
+/* { dg-options "-O3 -moverride=tune=cse_sve_vl_constants" } */
+
+void __attribute__((noinline, noclone))
+vadd (int *dst, int *op1, int *op2, int count)
+{
+ for (int i = 0; i < count; ++i)
+ dst[i] = op1[i] + op2[i];
+}
+
+/* { dg-final { scan-assembler-not {\tincw\tx[0-9]+} } } */
+