These tests check the sched2 dump, so skip them for optimization levels
that do not enable sched2.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/mcpu-6.c: Skip for -O0, -O1, -Og.
* gcc.target/riscv/mcpu-7.c: Likewise.
/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-O0" "-O1" "-Og" } } */
/* Verify -mtune has higher priority than -mcpu for pipeline model . */
/* { dg-options "-mcpu=sifive-u74 -mtune=rocket -fdump-rtl-sched2-details -march=rv32i -mabi=ilp32" } */
/* { dg-final { scan-rtl-dump "simple_return\[ \]+:alu" "sched2" } } */
/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-O0" "-O1" "-Og" } } */
/* Verify -mtune has higher priority than -mcpu for pipeline model . */
/* { dg-options "-mcpu=sifive-s21 -mtune=sifive-u74 -fdump-rtl-sched2-details -march=rv32i -mabi=ilp32" } */
/* { dg-final { scan-rtl-dump "simple_return\[ \]+:sifive_7_B" "sched2" } } */