fix maxvl calc logic

diff --git a/hwacha/insns/vsetcfg.h b/hwacha/insns/vsetcfg.h
index 8ca408c93e4e20d0e8455ada6b79b18d780f16b9..a5fd9594dea82c96499efc4c71b6bd1ceefd08f5 100644 (file)
--- a/hwacha/insns/vsetcfg.h
+++ b/hwacha/insns/vsetcfg.h
@@ -4,6 +4,10 @@ uint32_t nfpr = ((XS1 >> 6) & 0x3f) + ((insn.i_imm() >> 6) & 0x3f);
 // raise trap when nxpr/nfpr is larger than possible
 WRITE_NXPR(nxpr);
 WRITE_NFPR(nfpr);
-uint32_t maxvl = 8 * (256 / (nxpr-1 + nfpr));
+uint32_t maxvl;
+if (nxpr + nfpr < 2)
+  maxvl = 8 * 256;
+else
+  maxvl = 8 * (256 / (nxpr-1 + nfpr));
 WRITE_MAXVL(maxvl);
 WRITE_VL(0);