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[PULL,v2,56/60] tcg/optimize: Propagate sign info for bit counting

Message ID 20211029043329.1518029-57-richard.henderson@linaro.org
State Accepted
Commit 2b9d0c59edec097c72ce9b917d3c08dc5d59cdda
Headers show
Series tcg patch queue | expand

Commit Message

Richard Henderson Oct. 29, 2021, 4:33 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(-)

-- 
2.25.1
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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;
 }