From 7deea126b24508e8ffa7aa4aecfa6fa97eddc384 Mon Sep 17 00:00:00 2001 From: Claudio Fontana Date: Wed, 12 Jun 2013 16:20:22 +0100 Subject: [PATCH] tcg/aarch64: implement AND/TEST immediate pattern add functions to AND/TEST registers with immediate patterns. Signed-off-by: Claudio Fontana Reviewed-by: Richard Henderson Message-id: 51AC9A0C.3090303@huawei.com Signed-off-by: Peter Maydell --- tcg/aarch64/tcg-target.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c index 2aa9f75a25..bb59794046 100644 --- a/tcg/aarch64/tcg-target.c +++ b/tcg/aarch64/tcg-target.c @@ -580,6 +580,40 @@ static inline void tcg_out_call(TCGContext *s, tcg_target_long target) } } +/* encode a logical immediate, mapping user parameter + M=set bits pattern length to S=M-1 */ +static inline unsigned int +aarch64_limm(unsigned int m, unsigned int r) +{ + assert(m > 0); + return r << 16 | (m - 1) << 10; +} + +/* test a register against an immediate bit pattern made of + M set bits rotated right by R. + Examples: + to test a 32/64 reg against 0x00000007, pass M = 3, R = 0. + to test a 32/64 reg against 0x000000ff, pass M = 8, R = 0. + to test a 32bit reg against 0xff000000, pass M = 8, R = 8. + to test a 32bit reg against 0xff0000ff, pass M = 16, R = 8. + */ +static inline void tcg_out_tst(TCGContext *s, int ext, TCGReg rn, + unsigned int m, unsigned int r) +{ + /* using TST alias of ANDS XZR, Xn,#bimm64 0x7200001f */ + unsigned int base = ext ? 0xf240001f : 0x7200001f; + tcg_out32(s, base | aarch64_limm(m, r) | rn << 5); +} + +/* and a register with a bit pattern, similarly to TST, no flags change */ +static inline void tcg_out_andi(TCGContext *s, int ext, TCGReg rd, TCGReg rn, + unsigned int m, unsigned int r) +{ + /* using AND 0x12000000 */ + unsigned int base = ext ? 0x92400000 : 0x12000000; + tcg_out32(s, base | aarch64_limm(m, r) | rn << 5 | rd); +} + static inline void tcg_out_ret(TCGContext *s) { /* emit RET { LR } */