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target-i386: Add CC_OP_CLR

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Special case xor with self.  We need not even store the known
zero into cc_src.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-01-29 13:38:43 -08:00
parent 321c535105
commit 436ff2d227
4 changed files with 21 additions and 3 deletions
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2
target-i386/cpu.h
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@ -645,6 +645,8 @@ typedef enum {
CC_OP_ADOX, /* CC_DST = O, CC_SRC = rest. */
CC_OP_ADCOX, /* CC_DST = C, CC_SRC2 = O, CC_SRC = rest. */
CC_OP_CLR, /* Z set, all other flags clear. */
CC_OP_NB,
} CCOp;