diff mbox series

[PULL,55/56] tcg/optimize: Propagate sign info for bit counting

Message ID 20211028024131.1492790-56-richard.henderson@linaro.org (mailing list archive)
State New, archived
Headers show
Series [PULL,01/56] qemu/int128: Add int128_{not,xor} | expand

Commit Message

Richard Henderson Oct. 28, 2021, 2:41 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.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 5fa4d7285d..c0eccc61d6 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1229,7 +1229,7 @@  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(ctx->z_mask);
     return false;
 }
 
@@ -1249,6 +1249,7 @@  static bool fold_ctpop(OptContext *ctx, TCGOp *op)
     default:
         g_assert_not_reached();
     }
+    ctx->s_mask = smask_from_zmask(ctx->z_mask);
     return false;
 }