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

Message ID 20210830062451.639572-48-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg: optimize redundant sign extensions | expand

Commit Message

Richard Henderson Aug. 30, 2021, 6:24 a.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(+)

-- 
2.25.1
diff mbox series

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 788a5acf10..dad72b2ff5 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;
 }