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target-tilegx: Tidy simd_helper.c

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Using the V1 macro when we want to replicate a byte across
the 8 elements of the word.  Using deposit and extract for
manipulating specific elements.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-09-21 17:27:11 -07:00
parent 5fdb4671b0
commit 0551301076
1 changed files with 7 additions and 4 deletions
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11
target-tilegx/simd_helper.c
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@ -23,12 +23,16 @@
#include "exec/helper-proto.h"
/* Broadcast a value to all elements of a vector. */
#define V1(X) (((X) & 0xff) * 0x0101010101010101ull)
uint64_t helper_v1shl(uint64_t a, uint64_t b)
{
uint64_t m;
b &= 7;
m = 0x0101010101010101ULL * (0xff >> b);
m = V1(0xff >> b);
return (a & m) << b;
}
@ -37,7 +41,7 @@ uint64_t helper_v1shru(uint64_t a, uint64_t b)
uint64_t m;
b &= 7;
m = 0x0101010101010101ULL * ((0xff << b) & 0xff);
m = V1(0xff << b);
return (a & m) >> b;
}
@ -48,8 +52,7 @@ uint64_t helper_v1shrs(uint64_t a, uint64_t b)
b &= 7;
for (i = 0; i < 64; i += 8) {
int64_t ae = (int8_t)(a >> i);
r |= ((ae >> b) & 0xff) << i;
r = deposit64(r, i, 8, sextract64(a, i + b, 8 - b));
}
return r;
}