[PATCH] RISC-V: Fix missing boolean_expression in zmmul extension

[Liao Shihua]

Missing boolean_expression TARGET_ZMMUL in riscv_rtx_costs() casuse different 
instructions when multiplying an integer with a constant.
( https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1482 )

int foo(int *ib) {
    *ib = *ib * 33938;
    return 0;
}

rv64im:
        lw      a4,0(a1)
        li      a5,32768
        addiw   a5,a5,1170
        mulw    a5,a5,a4
        sw      a5,0(a1)
        ret

rv64i_zmmul:
        lw      a4,0(a1)
        slliw   a5,a4,5
        addw    a5,a5,a4
        slliw   a5,a5,3
        addw    a5,a5,a4
        slliw   a5,a5,3
        addw    a5,a5,a4
        slliw   a5,a5,3
        addw    a5,a5,a4
        slliw   a5,a5,1
        sw      a5,0(a1)
        ret

Fixed.

gcc/ChangeLog:

        * config/riscv/riscv.cc (riscv_rtx_costs): Add TARGET_ZMMUL.

---
 gcc/config/riscv/riscv.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 85df5b7ab49..580ae007181 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -3753,7 +3753,7 @@ riscv_rtx_costs (rtx x, machine_mode mode, int 
outer_code, int opno ATTRIBUTE_UN
     case MULT:
       if (float_mode_p)
        *total = tune_param->fp_mul[mode == DFmode];
-      else if (!TARGET_MUL)
+      else if (!(TARGET_MUL || TARGET_ZMMUL))
        /* Estimate the cost of a library call.  */
        *total = COSTS_N_INSNS (speed ? 32 : 6);
       else if (GET_MODE_SIZE (mode).to_constant () > UNITS_PER_WORD)
-- 
2.34.1