===================================================================
@@ -31861,6 +31861,52 @@ ix86_modes_tieable_p (enum machine_mode mode1, enu
return false;
}
+/* Return the cost of moving between two registers of mode MODE. */
+
+static int
+ix86_set_reg_reg_cost (enum machine_mode mode)
+{
+ unsigned int units = UNITS_PER_WORD;
+
+ switch (GET_MODE_CLASS (mode))
+ {
+ default:
+ break;
+
+ case MODE_CC:
+ units = GET_MODE_SIZE (CCmode);
+ break;
+
+ case MODE_FLOAT:
+ if ((TARGET_SSE2 && mode == TFmode)
+ || (TARGET_80387 && mode == XFmode)
+ || ((TARGET_80387 || TARGET_SSE2) && mode == DFmode)
+ || ((TARGET_80387 || TARGET_SSE) && mode == SFmode))
+ units = GET_MODE_SIZE (mode);
+ break;
+
+ case MODE_COMPLEX_FLOAT:
+ if ((TARGET_SSE2 && mode == TCmode)
+ || (TARGET_80387 && mode == XCmode)
+ || ((TARGET_80387 || TARGET_SSE2) && mode == DCmode)
+ || ((TARGET_80387 || TARGET_SSE) && mode == SCmode))
+ units = GET_MODE_SIZE (mode);
+ break;
+
+ case MODE_VECTOR_INT:
+ case MODE_VECTOR_FLOAT:
+ if ((TARGET_AVX && VALID_AVX256_REG_MODE (mode))
+ || (TARGET_SSE2 && VALID_SSE2_REG_MODE (mode))
+ || (TARGET_SSE && VALID_SSE_REG_MODE (mode))
+ || (TARGET_MMX && VALID_MMX_REG_MODE (mode)))
+ units = GET_MODE_SIZE (mode);
+ }
+
+ /* Return the cost of moving between two registers of mode MODE,
+ assuming that the move will be in pieces of at most UNITS bytes. */
+ return COSTS_N_INSNS ((GET_MODE_SIZE (mode) + units - 1) / units);
+}
+
/* Compute a (partial) cost for rtx X. Return true if the complete
cost has been computed, and false if subexpressions should be
scanned. In either case, *TOTAL contains the cost result. */
@@ -31875,6 +31921,15 @@ ix86_rtx_costs (rtx x, int code, int outer_code_i,
switch (code)
{
+ case SET:
+ if (register_operand (SET_DEST (x), VOIDmode)
+ && reg_or_0_operand (SET_SRC (x), VOIDmode))
+ {
+ *total = ix86_set_reg_reg_cost (GET_MODE (SET_DEST (x)));
+ return true;
+ }
+ return false;
+
case CONST_INT:
case CONST:
case LABEL_REF: