diff options
| author | Stefan Brankovic <stefan.brankovic@rt-rk.com> | 2019-07-15 16:22:52 +0200 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2019-08-21 17:17:11 +1000 |
| commit | 1872588ede5770751ebc0e1df9909c8a785cb549 (patch) | |
| tree | 5c81bfb14c7892d735a3448b58c20ffdc354f0f9 /target/ppc/int_helper.c | |
| parent | b8313f0d91b192c9415b3c678b387acb77ad112b (diff) | |
target/ppc: Optimize emulation of vclzw instruction
Optimize Altivec instruction vclzw (Vector Count Leading Zeros Word).
This instruction counts the number of leading zeros of each word element
in source register and places result in the appropriate word element of
destination register.
Counting is to be performed in four iterations of for loop(one for each
word elemnt of source register vB). Every iteration consists of loading
appropriate word element from source register, counting leading zeros
with tcg_gen_clzi_i32, and saving the result in appropriate word element
of destination register.
Signed-off-by: Stefan Brankovic <stefan.brankovic@rt-rk.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1563200574-11098-7-git-send-email-stefan.brankovic@rt-rk.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target/ppc/int_helper.c')
| -rw-r--r-- | target/ppc/int_helper.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c index b82765db33..46deb57a34 100644 --- a/target/ppc/int_helper.c +++ b/target/ppc/int_helper.c @@ -1819,15 +1819,12 @@ VUPK(lsw, s64, s32, UPKLO) #define clzb(v) ((v) ? clz32((uint32_t)(v) << 24) : 8) #define clzh(v) ((v) ? clz32((uint32_t)(v) << 16) : 16) -#define clzw(v) clz32((v)) VGENERIC_DO(clzb, u8) VGENERIC_DO(clzh, u16) -VGENERIC_DO(clzw, u32) #undef clzb #undef clzh -#undef clzw #define ctzb(v) ((v) ? ctz32(v) : 8) #define ctzh(v) ((v) ? ctz32(v) : 16) |