* [PATCH 1/2] tcg: add dup_const_tl wrapper
@ 2021-09-28 20:54 Philipp Tomsich
2021-09-28 20:54 ` [PATCH 2/2] target/riscv: Use dup_const_tl in orc.b to legalise truncation of constant Philipp Tomsich
2021-10-03 17:30 ` [PATCH 1/2] tcg: add dup_const_tl wrapper Richard Henderson
0 siblings, 2 replies; 4+ messages in thread
From: Philipp Tomsich @ 2021-09-28 20:54 UTC (permalink / raw)
To: qemu-devel; +Cc: Alistair Francis, Richard Henderson, Philipp Tomsich
dup_const always generates a uint64_t, which may exceed the size of a
target_long (generating warnings with recent-enough compilers).
To ensure that we can use dup_const both for 64bit and 32bit targets,
this adds dup_const_tl, which wraps dup_const and legalises the
truncation to target_long by casting it to target_long.
Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
---
include/tcg/tcg.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index 44ccd86f3e..8f8a209600 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -1272,6 +1272,11 @@ uint64_t dup_const(unsigned vece, uint64_t c);
: (qemu_build_not_reached_always(), 0)) \
: dup_const(VECE, C))
+static inline target_long dup_const_tl(unsigned vece, uint64_t c)
+{
+ return (target_long)dup_const(vece, c);
+}
+
/*
* Memory helpers that will be used by TCG generated code.
*/
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] target/riscv: Use dup_const_tl in orc.b to legalise truncation of constant
2021-09-28 20:54 [PATCH 1/2] tcg: add dup_const_tl wrapper Philipp Tomsich
@ 2021-09-28 20:54 ` Philipp Tomsich
2021-10-03 17:30 ` Richard Henderson
2021-10-03 17:30 ` [PATCH 1/2] tcg: add dup_const_tl wrapper Richard Henderson
1 sibling, 1 reply; 4+ messages in thread
From: Philipp Tomsich @ 2021-09-28 20:54 UTC (permalink / raw)
To: qemu-devel; +Cc: Alistair Francis, Richard Henderson, Philipp Tomsich
We need to use the newly introduced dup_const_tl in orc.b to legalise
the truncation (to target_long) of the constant generated with dup_const.
Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
---
target/riscv/insn_trans/trans_rvb.c.inc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/riscv/insn_trans/trans_rvb.c.inc b/target/riscv/insn_trans/trans_rvb.c.inc
index 2927353d9b..185c3e9a60 100644
--- a/target/riscv/insn_trans/trans_rvb.c.inc
+++ b/target/riscv/insn_trans/trans_rvb.c.inc
@@ -249,7 +249,7 @@ static bool trans_rev8_64(DisasContext *ctx, arg_rev8_64 *a)
static void gen_orc_b(TCGv ret, TCGv source1)
{
TCGv tmp = tcg_temp_new();
- TCGv ones = tcg_constant_tl(dup_const(MO_8, 0x01));
+ TCGv ones = tcg_constant_tl(dup_const_tl(MO_8, 0x01));
/* Set lsb in each byte if the byte was zero. */
tcg_gen_sub_tl(tmp, source1, ones);
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 1/2] tcg: add dup_const_tl wrapper
2021-09-28 20:54 [PATCH 1/2] tcg: add dup_const_tl wrapper Philipp Tomsich
2021-09-28 20:54 ` [PATCH 2/2] target/riscv: Use dup_const_tl in orc.b to legalise truncation of constant Philipp Tomsich
@ 2021-10-03 17:30 ` Richard Henderson
1 sibling, 0 replies; 4+ messages in thread
From: Richard Henderson @ 2021-10-03 17:30 UTC (permalink / raw)
To: Philipp Tomsich, qemu-devel; +Cc: Alistair Francis
On 9/28/21 4:54 PM, Philipp Tomsich wrote:
> dup_const always generates a uint64_t, which may exceed the size of a
> target_long (generating warnings with recent-enough compilers).
>
> To ensure that we can use dup_const both for 64bit and 32bit targets,
> this adds dup_const_tl, which wraps dup_const and legalises the
> truncation to target_long by casting it to target_long.
>
> Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
>
> ---
>
> include/tcg/tcg.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
> index 44ccd86f3e..8f8a209600 100644
> --- a/include/tcg/tcg.h
> +++ b/include/tcg/tcg.h
> @@ -1272,6 +1272,11 @@ uint64_t dup_const(unsigned vece, uint64_t c);
> : (qemu_build_not_reached_always(), 0)) \
> : dup_const(VECE, C))
>
> +static inline target_long dup_const_tl(unsigned vece, uint64_t c)
> +{
> + return (target_long)dup_const(vece, c);
> +}
While this works, it avoids the qemu_build_not_reached() sanity check within dup_const. I
think perhaps this should be like
#if TARGET_LONG_BITS == 64
# define dup_const_tl dup_const
#else
# define dup_const_tl(VECE, C) \
... stuff, excluding the MO_64 case
... using 32-bit multiplier constants
... using (uint32_t)(dup_const)(VECE, C) at the end
#endif
r~
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 2/2] target/riscv: Use dup_const_tl in orc.b to legalise truncation of constant
2021-09-28 20:54 ` [PATCH 2/2] target/riscv: Use dup_const_tl in orc.b to legalise truncation of constant Philipp Tomsich
@ 2021-10-03 17:30 ` Richard Henderson
0 siblings, 0 replies; 4+ messages in thread
From: Richard Henderson @ 2021-10-03 17:30 UTC (permalink / raw)
To: Philipp Tomsich, qemu-devel; +Cc: Alistair Francis
On 9/28/21 4:54 PM, Philipp Tomsich wrote:
> We need to use the newly introduced dup_const_tl in orc.b to legalise
> the truncation (to target_long) of the constant generated with dup_const.
>
> Signed-off-by: Philipp Tomsich<philipp.tomsich@vrull.eu>
> ---
>
> target/riscv/insn_trans/trans_rvb.c.inc | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-10-03 17:30 ` [PATCH 1/2] tcg: add dup_const_tl wrapper Richard Henderson
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