target/arm: Coverity fixups

[Qemu-devel] [PATCH 2/2] target/arm: Tidy condition in disas_simd_two_reg_misc

Posted by Richard Henderson 7 years, 6 months ago

Path analysis shows that size == 3 && !is_q has been eliminated.

Fixes: Coverity CID1385853
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate-a64.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 97950dce1a..6d49f30b4a 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -11473,7 +11473,11 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
         /* All 64-bit element operations can be shared with scalar 2misc */
         int pass;
 
-        for (pass = 0; pass < (is_q ? 2 : 1); pass++) {
+        /* Coverity claims (size == 3 && !is_q) has been eliminated
+         * from all paths leading to here.
+         */
+        tcg_debug_assert(is_q);
+        for (pass = 0; pass < 2; pass++) {
             TCGv_i64 tcg_op = tcg_temp_new_i64();
             TCGv_i64 tcg_res = tcg_temp_new_i64();
 
-- 
2.14.3

Re: [Qemu-devel] [Qemu-arm] [PATCH 2/2] target/arm: Tidy condition in disas_simd_two_reg_misc

Posted by Alex Bennée 7 years, 6 months ago

Richard Henderson <richard.henderson@linaro.org> writes:

> Path analysis shows that size == 3 && !is_q has been eliminated.
>
> Fixes: Coverity CID1385853
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  target/arm/translate-a64.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
> index 97950dce1a..6d49f30b4a 100644
> --- a/target/arm/translate-a64.c
> +++ b/target/arm/translate-a64.c
> @@ -11473,7 +11473,11 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
>          /* All 64-bit element operations can be shared with scalar 2misc */
>          int pass;
>
> -        for (pass = 0; pass < (is_q ? 2 : 1); pass++) {
> +        /* Coverity claims (size == 3 && !is_q) has been eliminated
> +         * from all paths leading to here.
> +         */
> +        tcg_debug_assert(is_q);
> +        for (pass = 0; pass < 2; pass++) {
>              TCGv_i64 tcg_op = tcg_temp_new_i64();
>              TCGv_i64 tcg_res = tcg_temp_new_i64();


--
Alex Bennée

[Qemu-devel] [PATCH 1/2] target/arm: Tidy conditions in handle_vec_simd_shri
[Qemu-devel] [PATCH 2/2] target/arm: Tidy condition in disas_simd_two_reg_misc