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Re: [PATCH 1/1] target-ppc: fix rlwimi, rlwinm, rlwnm for Clang-9
From: |
David Gibson |
Subject: |
Re: [PATCH 1/1] target-ppc: fix rlwimi, rlwinm, rlwnm for Clang-9 |
Date: |
Tue, 5 May 2020 15:08:15 +1000 |
On Fri, May 01, 2020 at 03:09:13PM -0400, Daniele Buono wrote:
> Starting with Clang v9, -Wtype-limits is implemented and triggers a
> few "result of comparison is always true" errors when compiling PPC32
> targets.
>
> The comparisons seem to be necessary only on PPC64, since the
> else branch in PPC32 only has a "g_assert_not_reached();" in all cases.
>
> This patch restructures the code so that PPC32 does not execute the
> check, while PPC64 works like before
>
> Signed-off-by: Daniele Buono <address@hidden>
Urgh. #ifdefs intertangled with if statements gets pretty ugly. But,
then, it's already pretty ugly, so, applied.
> ---
> target/ppc/translate.c | 34 +++++++++++++++++++---------------
> 1 file changed, 19 insertions(+), 15 deletions(-)
>
> diff --git a/target/ppc/translate.c b/target/ppc/translate.c
> index 807d14faaa..9400fa2c7c 100644
> --- a/target/ppc/translate.c
> +++ b/target/ppc/translate.c
> @@ -1882,6 +1882,7 @@ static void gen_rlwimi(DisasContext *ctx)
> tcg_gen_deposit_tl(t_ra, t_ra, t_rs, sh, me - mb + 1);
> } else {
> target_ulong mask;
> + TCGv_i32 t0;
> TCGv t1;
>
> #if defined(TARGET_PPC64)
> @@ -1891,20 +1892,20 @@ static void gen_rlwimi(DisasContext *ctx)
> mask = MASK(mb, me);
>
> t1 = tcg_temp_new();
> +#if defined(TARGET_PPC64)
> if (mask <= 0xffffffffu) {
> - TCGv_i32 t0 = tcg_temp_new_i32();
> +#endif
> + t0 = tcg_temp_new_i32();
> tcg_gen_trunc_tl_i32(t0, t_rs);
> tcg_gen_rotli_i32(t0, t0, sh);
> tcg_gen_extu_i32_tl(t1, t0);
> tcg_temp_free_i32(t0);
> - } else {
> #if defined(TARGET_PPC64)
> + } else {
> tcg_gen_deposit_i64(t1, t_rs, t_rs, 32, 32);
> tcg_gen_rotli_i64(t1, t1, sh);
> -#else
> - g_assert_not_reached();
> -#endif
> }
> +#endif
>
> tcg_gen_andi_tl(t1, t1, mask);
> tcg_gen_andi_tl(t_ra, t_ra, ~mask);
> @@ -1938,7 +1939,9 @@ static void gen_rlwinm(DisasContext *ctx)
> me += 32;
> #endif
> mask = MASK(mb, me);
> +#if defined(TARGET_PPC64)
> if (mask <= 0xffffffffu) {
> +#endif
> if (sh == 0) {
> tcg_gen_andi_tl(t_ra, t_rs, mask);
> } else {
> @@ -1949,15 +1952,13 @@ static void gen_rlwinm(DisasContext *ctx)
> tcg_gen_extu_i32_tl(t_ra, t0);
> tcg_temp_free_i32(t0);
> }
> - } else {
> #if defined(TARGET_PPC64)
> + } else {
> tcg_gen_deposit_i64(t_ra, t_rs, t_rs, 32, 32);
> tcg_gen_rotli_i64(t_ra, t_ra, sh);
> tcg_gen_andi_i64(t_ra, t_ra, mask);
> -#else
> - g_assert_not_reached();
> -#endif
> }
> +#endif
> }
> if (unlikely(Rc(ctx->opcode) != 0)) {
> gen_set_Rc0(ctx, t_ra);
> @@ -1972,6 +1973,9 @@ static void gen_rlwnm(DisasContext *ctx)
> TCGv t_rb = cpu_gpr[rB(ctx->opcode)];
> uint32_t mb = MB(ctx->opcode);
> uint32_t me = ME(ctx->opcode);
> + TCGv_i32 t0;
> + TCGv_i32 t1;
> +
> target_ulong mask;
>
> #if defined(TARGET_PPC64)
> @@ -1980,9 +1984,11 @@ static void gen_rlwnm(DisasContext *ctx)
> #endif
> mask = MASK(mb, me);
>
> +#if defined(TARGET_PPC64)
> if (mask <= 0xffffffffu) {
> - TCGv_i32 t0 = tcg_temp_new_i32();
> - TCGv_i32 t1 = tcg_temp_new_i32();
> +#endif
> + t0 = tcg_temp_new_i32();
> + t1 = tcg_temp_new_i32();
> tcg_gen_trunc_tl_i32(t0, t_rb);
> tcg_gen_trunc_tl_i32(t1, t_rs);
> tcg_gen_andi_i32(t0, t0, 0x1f);
> @@ -1990,17 +1996,15 @@ static void gen_rlwnm(DisasContext *ctx)
> tcg_gen_extu_i32_tl(t_ra, t1);
> tcg_temp_free_i32(t0);
> tcg_temp_free_i32(t1);
> - } else {
> #if defined(TARGET_PPC64)
> + } else {
> TCGv_i64 t0 = tcg_temp_new_i64();
> tcg_gen_andi_i64(t0, t_rb, 0x1f);
> tcg_gen_deposit_i64(t_ra, t_rs, t_rs, 32, 32);
> tcg_gen_rotl_i64(t_ra, t_ra, t0);
> tcg_temp_free_i64(t0);
> -#else
> - g_assert_not_reached();
> -#endif
> }
> +#endif
>
> tcg_gen_andi_tl(t_ra, t_ra, mask);
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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