diff mbox series

[v2,47/48] tcg/optimize: Propagate sign info for bit counting

Message ID 20211007195456.1168070-48-richard.henderson@linaro.org
State New
Headers show
Series tcg: optimize redundant sign extensions | expand

Commit Message

Richard Henderson Oct. 7, 2021, 7:54 p.m. UTC 
The results are generally 6 bit unsigned values, though
the count leading and trailing bits may produce any value
for a zero input.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 1c106bfbc3..678e7c1983 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1216,6 +1216,7 @@  static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
         g_assert_not_reached();
     }
     ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask;
+    ctx->s_mask = smask_from_zmask(z_mask);
 
     return false;
 }
@@ -1236,6 +1237,7 @@  static bool fold_ctpop(OptContext *ctx, TCGOp *op)
     default:
         g_assert_not_reached();
     }
+    ctx->s_mask = smask_from_zmask(ctx->z_mask);
     return false;
 }