diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 93a8b28..3131efd 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -42020,6 +42020,53 @@ ix86_bnd_prefixed_insn_p (rtx insn ATTRIBUTE_UNUSED) return false; } +void +ix86_expand_sse2_abs (rtx op0, rtx op1) +{ + enum machine_mode mode = GET_MODE (op0); + rtx tmp0, tmp1; + + switch (mode) + { + /* For 32-bit signed integer X, the best way to calculate the absolute + value of X is (((signed) X >> (W-1)) ^ X) - ((signed) X >> (W-1)). */ + case V4SImode: + tmp0 = expand_simple_binop (mode, ASHIFTRT, op1, + GEN_INT (GET_MODE_BITSIZE + (GET_MODE_INNER (mode)) - 1), + NULL, 0, OPTAB_DIRECT); + if (tmp0) + tmp1 = expand_simple_binop (mode, XOR, op1, tmp0, + NULL, 0, OPTAB_DIRECT); + if (tmp0 && tmp1) + expand_simple_binop (mode, MINUS, tmp1, tmp0, + op0, 0, OPTAB_DIRECT); + break; + + /* For 16-bit signed integer X, the best way to calculate the absolute + value of X is max (X, -X), as SSE2 provides the PMAXSW insn. */ + case V8HImode: + tmp0 = expand_unop (mode, neg_optab, op1, NULL_RTX, 0); + if (tmp0) + expand_simple_binop (mode, SMAX, op1, tmp0, op0, 0, + OPTAB_DIRECT); + break; + + /* For 8-bit signed integer X, the best way to calculate the absolute + value of X is min ((unsigned char) X, (unsigned char) (-X)), + as SSE2 provides the PMINUB insn. */ + case V16QImode: + tmp0 = expand_unop (mode, neg_optab, op1, NULL_RTX, 0); + if (tmp0) + expand_simple_binop (V16QImode, UMIN, op1, tmp0, op0, 0, + OPTAB_DIRECT); + break; + + default: + break; + } +} + /* Expand an insert into a vector register through pinsr insn. Return true if successful. */ |