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target/ppc: Simplify endianness handling in Altivec opcodes 

Access the memory in big-endian order,
swap bytes when MSR.LE is set.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20251126202200.23100-22-philmd@linaro.org>
pull/316/head
Philippe Mathieu-Daudé 8 months ago
parent
ff9359fca2
commit
81c389fd6f
1 changed files with 10 additions and 21 deletions
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  1. 31
      target/ppc/mem_helper.c

31
target/ppc/mem_helper.c
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@ -31,15 +31,6 @@
/* #define DEBUG_OP */
static inline bool needs_byteswap(const CPUPPCState *env)
{
#if TARGET_BIG_ENDIAN
return FIELD_EX64(env->msr, MSR, LE);
#else
return !FIELD_EX64(env->msr, MSR, LE);
#endif
}
/*****************************************************************************/
/* Memory load and stores */
@ -401,11 +392,10 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
int adjust = HI_IDX * (n_elems - 1); \
int sh = sizeof(r->element[0]) >> 1; \
int index = (addr & 0xf) >> sh; \
if (FIELD_EX64(env->msr, MSR, LE)) { \
index = n_elems - index - 1; \
} \
bool byteswap = FIELD_EX64(env->msr, MSR, LE); \
\
if (needs_byteswap(env)) { \
if (byteswap) { \
index = n_elems - index - 1; \
r->element[LO_IDX ? index : (adjust - index)] = \
swap(access(env, addr, GETPC())); \
} else { \
@ -415,8 +405,8 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
}
#define I(x) (x)
LVE(LVEBX, cpu_ldub_data_ra, I, u8)
LVE(LVEHX, cpu_lduw_data_ra, bswap16, u16)
LVE(LVEWX, cpu_ldl_data_ra, bswap32, u32)
LVE(LVEHX, cpu_lduw_be_data_ra, bswap16, u16)
LVE(LVEWX, cpu_ldl_be_data_ra, bswap32, u32)
#undef I
#undef LVE
@ -428,11 +418,10 @@ LVE(LVEWX, cpu_ldl_data_ra, bswap32, u32)
int adjust = HI_IDX * (n_elems - 1); \
int sh = sizeof(r->element[0]) >> 1; \
int index = (addr & 0xf) >> sh; \
if (FIELD_EX64(env->msr, MSR, LE)) { \
index = n_elems - index - 1; \
} \
bool byteswap = FIELD_EX64(env->msr, MSR, LE); \
\
if (needs_byteswap(env)) { \
if (byteswap) { \
index = n_elems - index - 1; \
access(env, addr, swap(r->element[LO_IDX ? index : \
(adjust - index)]), \
GETPC()); \
@ -443,8 +432,8 @@ LVE(LVEWX, cpu_ldl_data_ra, bswap32, u32)
}
#define I(x) (x)
STVE(STVEBX, cpu_stb_data_ra, I, u8)
STVE(STVEHX, cpu_stw_data_ra, bswap16, u16)
STVE(STVEWX, cpu_stl_data_ra, bswap32, u32)
STVE(STVEHX, cpu_stw_be_data_ra, bswap16, u16)
STVE(STVEWX, cpu_stl_be_data_ra, bswap32, u32)
#undef I
#undef LVE

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