[PATCH v2 3/4] target/riscv: enforce even register constraints for Zdinx fcvt pairs

fcvt.d.h and fcvt.h.d access a 64-bit double held in a register
pair, so under Zdinx/Zhinxmin the odd-rd (fcvt.d.h) and odd-rs1
(fcvt.h.d) encodings are reserved.  Add the missing REQUIRE_EVEN
checks so those encodings raise an illegal-instruction exception
instead of retiring.

Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/4109
Reviewed-by: Alistair Francis <[email protected]>
Signed-off-by: wangyang <[email protected]>
---
 1 file changed, 2 insertions(+), 0 deletions(-)

diff --git a/target/riscv/tcg/insn_trans/trans_rvzfh.c.inc b/target/riscv/tcg/insn_trans/trans_rvzfh.c.inc
index f36b46c2118..6ee71506d62 100644
--- a/target/riscv/tcg/insn_trans/trans_rvzfh.c.inc
+++ b/target/riscv/tcg/insn_trans/trans_rvzfh.c.inc
@@ -413,6 +413,7 @@ static bool trans_fcvt_d_h(DisasContext *ctx, arg_fcvt_d_h *a)
     REQUIRE_FPU;
     REQUIRE_ZFHMIN_OR_ZHINXMIN(ctx);
     REQUIRE_ZDINX_OR_D(ctx);
+    REQUIRE_EVEN(ctx, a->rd);
 
     TCGv_i64 dest = dest_fpr(ctx, a->rd);
     TCGv_i64 src1 = get_fpr_hs(ctx, a->rs1);
@@ -447,6 +448,7 @@ static bool trans_fcvt_h_d(DisasContext *ctx, arg_fcvt_h_d *a)
     REQUIRE_FPU;
     REQUIRE_ZFHMIN_OR_ZHINXMIN(ctx);
     REQUIRE_ZDINX_OR_D(ctx);
+    REQUIRE_EVEN(ctx, a->rs1);
 
     TCGv_i64 dest = dest_fpr(ctx, a->rd);
     TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);