unsigned short issue_rate;
unsigned short branch_cost;
unsigned short memory_cost;
+ unsigned short fmv_cost;
bool slow_unaligned_access;
};
1, /* issue_rate */
3, /* branch_cost */
5, /* memory_cost */
+ 8, /* fmv_cost */
true, /* slow_unaligned_access */
};
2, /* issue_rate */
4, /* branch_cost */
3, /* memory_cost */
+ 8, /* fmv_cost */
true, /* slow_unaligned_access */
};
1, /* issue_rate */
3, /* branch_cost */
5, /* memory_cost */
+ 8, /* fmv_cost */
false, /* slow_unaligned_access */
};
1, /* issue_rate */
1, /* branch_cost */
2, /* memory_cost */
+ 8, /* fmv_cost */
false, /* slow_unaligned_access */
};
riscv_register_move_cost (machine_mode mode,
reg_class_t from, reg_class_t to)
{
+ if ((from == FP_REGS && to == GR_REGS) ||
+ (from == GR_REGS && to == FP_REGS))
+ return tune_param->fmv_cost;
+
return riscv_secondary_memory_needed (mode, from, to) ? 8 : 2;
}
--- /dev/null
+/* Shamelessly plugged off gcc/testsuite/gcc.c-torture/execute/pr28982a.c.
+
+ The idea is to induce high register pressure for both int/fp registers
+ so that they spill. By default FMV instructions would be used to stash
+ int reg to a fp reg (and vice-versa) but that could be costlier than
+ spilling to stack. */
+
+/* { dg-do compile } */
+/* { dg-options "-march=rv64g -ffast-math" } */
+
+#define NITER 4
+#define NVARS 20
+#define MULTI(X) \
+ X( 0), X( 1), X( 2), X( 3), X( 4), X( 5), X( 6), X( 7), X( 8), X( 9), \
+ X(10), X(11), X(12), X(13), X(14), X(15), X(16), X(17), X(18), X(19)
+
+#define DECLAREI(INDEX) inc##INDEX = incs[INDEX]
+#define DECLAREF(INDEX) *ptr##INDEX = ptrs[INDEX], result##INDEX = 5
+#define LOOP(INDEX) result##INDEX += result##INDEX * (*ptr##INDEX), ptr##INDEX += inc##INDEX
+#define COPYOUT(INDEX) results[INDEX] = result##INDEX
+
+double *ptrs[NVARS];
+double results[NVARS];
+int incs[NVARS];
+
+void __attribute__((noinline))
+foo (int n)
+{
+ int MULTI (DECLAREI);
+ double MULTI (DECLAREF);
+ while (n--)
+ MULTI (LOOP);
+ MULTI (COPYOUT);
+}
+
+double input[NITER * NVARS];
+
+int
+main (void)
+{
+ int i;
+
+ for (i = 0; i < NVARS; i++)
+ ptrs[i] = input + i, incs[i] = i;
+ for (i = 0; i < NITER * NVARS; i++)
+ input[i] = i;
+ foo (NITER);
+ for (i = 0; i < NVARS; i++)
+ if (results[i] != i * NITER * (NITER + 1) / 2)
+ return 1;
+ return 0;
+}
+
+/* { dg-final { scan-assembler-not "\tfmv\\.d\\.x\t" } } */
+/* { dg-final { scan-assembler-not "\tfmv\\.x\\.d\t" } } */