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target-mips: implement unaligned loads using TCG

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Load/store from helpers should be avoided as they are quite
inefficient. Rewrite unaligned loads instructions using TCG and
aligned loads. The number of actual loads operations to implement
an unaligned load instruction is reduced from up to 8 to 1.

Note: As we can't rely on shift by 32 or 64 undefined behaviour,
the code loads already shift by one constants.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-10-09 21:53:21 +02:00
parent 18bba4dc78
commit fc40787abc
3 changed files with 62 additions and 159 deletions
Download patch file Download diff file Expand all files Collapse all files

142
target-mips/op_helper.c
View file

@ -350,56 +350,6 @@ HELPER_ST_ATOMIC(scd, ld, sd, 0x7)
#define GET_OFFSET(addr, offset) (addr - (offset))
#endif
target_ulong helper_lwl(CPUMIPSState *env, target_ulong arg1,
target_ulong arg2, int mem_idx)
{
target_ulong tmp;
tmp = do_lbu(env, arg2, mem_idx);
arg1 = (arg1 & 0x00FFFFFF) | (tmp << 24);
if (GET_LMASK(arg2) <= 2) {
tmp = do_lbu(env, GET_OFFSET(arg2, 1), mem_idx);
arg1 = (arg1 & 0xFF00FFFF) | (tmp << 16);
}
if (GET_LMASK(arg2) <= 1) {
tmp = do_lbu(env, GET_OFFSET(arg2, 2), mem_idx);
arg1 = (arg1 & 0xFFFF00FF) | (tmp << 8);
}
if (GET_LMASK(arg2) == 0) {
tmp = do_lbu(env, GET_OFFSET(arg2, 3), mem_idx);
arg1 = (arg1 & 0xFFFFFF00) | tmp;
}
return (int32_t)arg1;
}
target_ulong helper_lwr(CPUMIPSState *env, target_ulong arg1,
target_ulong arg2, int mem_idx)
{
target_ulong tmp;
tmp = do_lbu(env, arg2, mem_idx);
arg1 = (arg1 & 0xFFFFFF00) | tmp;
if (GET_LMASK(arg2) >= 1) {
tmp = do_lbu(env, GET_OFFSET(arg2, -1), mem_idx);
arg1 = (arg1 & 0xFFFF00FF) | (tmp << 8);
}
if (GET_LMASK(arg2) >= 2) {
tmp = do_lbu(env, GET_OFFSET(arg2, -2), mem_idx);
arg1 = (arg1 & 0xFF00FFFF) | (tmp << 16);
}
if (GET_LMASK(arg2) == 3) {
tmp = do_lbu(env, GET_OFFSET(arg2, -3), mem_idx);
arg1 = (arg1 & 0x00FFFFFF) | (tmp << 24);
}
return (int32_t)arg1;
}
void helper_swl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
int mem_idx)
{
@ -440,98 +390,6 @@ void helper_swr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
#define GET_LMASK64(v) (((v) & 7) ^ 7)
#endif
target_ulong helper_ldl(CPUMIPSState *env, target_ulong arg1,
target_ulong arg2, int mem_idx)
{
uint64_t tmp;
tmp = do_lbu(env, arg2, mem_idx);
arg1 = (arg1 & 0x00FFFFFFFFFFFFFFULL) | (tmp << 56);
if (GET_LMASK64(arg2) <= 6) {
tmp = do_lbu(env, GET_OFFSET(arg2, 1), mem_idx);
arg1 = (arg1 & 0xFF00FFFFFFFFFFFFULL) | (tmp << 48);
}
if (GET_LMASK64(arg2) <= 5) {
tmp = do_lbu(env, GET_OFFSET(arg2, 2), mem_idx);
arg1 = (arg1 & 0xFFFF00FFFFFFFFFFULL) | (tmp << 40);
}
if (GET_LMASK64(arg2) <= 4) {
tmp = do_lbu(env, GET_OFFSET(arg2, 3), mem_idx);
arg1 = (arg1 & 0xFFFFFF00FFFFFFFFULL) | (tmp << 32);
}
if (GET_LMASK64(arg2) <= 3) {
tmp = do_lbu(env, GET_OFFSET(arg2, 4), mem_idx);
arg1 = (arg1 & 0xFFFFFFFF00FFFFFFULL) | (tmp << 24);
}
if (GET_LMASK64(arg2) <= 2) {
tmp = do_lbu(env, GET_OFFSET(arg2, 5), mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFF00FFFFULL) | (tmp << 16);
}
if (GET_LMASK64(arg2) <= 1) {
tmp = do_lbu(env, GET_OFFSET(arg2, 6), mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFFFF00FFULL) | (tmp << 8);
}
if (GET_LMASK64(arg2) == 0) {
tmp = do_lbu(env, GET_OFFSET(arg2, 7), mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFFFFFF00ULL) | tmp;
}
return arg1;
}
target_ulong helper_ldr(CPUMIPSState *env, target_ulong arg1,
target_ulong arg2, int mem_idx)
{
uint64_t tmp;
tmp = do_lbu(env, arg2, mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFFFFFF00ULL) | tmp;
if (GET_LMASK64(arg2) >= 1) {
tmp = do_lbu(env, GET_OFFSET(arg2, -1), mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFFFF00FFULL) | (tmp << 8);
}
if (GET_LMASK64(arg2) >= 2) {
tmp = do_lbu(env, GET_OFFSET(arg2, -2), mem_idx);
arg1 = (arg1 & 0xFFFFFFFFFF00FFFFULL) | (tmp << 16);
}
if (GET_LMASK64(arg2) >= 3) {
tmp = do_lbu(env, GET_OFFSET(arg2, -3), mem_idx);
arg1 = (arg1 & 0xFFFFFFFF00FFFFFFULL) | (tmp << 24);
}
if (GET_LMASK64(arg2) >= 4) {
tmp = do_lbu(env, GET_OFFSET(arg2, -4), mem_idx);
arg1 = (arg1 & 0xFFFFFF00FFFFFFFFULL) | (tmp << 32);
}
if (GET_LMASK64(arg2) >= 5) {
tmp = do_lbu(env, GET_OFFSET(arg2, -5), mem_idx);
arg1 = (arg1 & 0xFFFF00FFFFFFFFFFULL) | (tmp << 40);
}
if (GET_LMASK64(arg2) >= 6) {
tmp = do_lbu(env, GET_OFFSET(arg2, -6), mem_idx);
arg1 = (arg1 & 0xFF00FFFFFFFFFFFFULL) | (tmp << 48);
}
if (GET_LMASK64(arg2) == 7) {
tmp = do_lbu(env, GET_OFFSET(arg2, -7), mem_idx);
arg1 = (arg1 & 0x00FFFFFFFFFFFFFFULL) | (tmp << 56);
}
return arg1;
}
void helper_sdl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
int mem_idx)
{