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6 commits

Author SHA1 Message Date
Richard Henderson d3d1c30c63 tcg/i386: Improve TSTNE/TESTEQ vs powers of two 
Use "test x,x" when the bit is one of the 4 sign bits.
Use "bt imm,x" otherwise.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2024-02-03 23:53:49 +00:00
Richard Henderson 73f97f0aa3 tcg/i386: Allow immediate as input to deposit_* 
We can use MOVB and MOVW with an immediate just as easily
as with a register input.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2023-08-24 11:22:42 -07:00
Richard Henderson 36df88c040 tcg/i386: Drop BYTEH deposits for 64-bit 
It is more useful to allow low-part deposits into all registers
than to restrict allocation for high-byte deposits.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2023-08-24 11:22:42 -07:00
Ilya Leoshkevich 22d2e5351a tcg/{i386, s390x}: Add earlyclobber to the op_add2's first output 
i386 and s390x implementations of op_add2 require an earlyclobber,
which is currently missing. This breaks VCKSM in s390x guests. E.g., on
x86_64 the following op:

    add2_i32 tmp2,tmp3,tmp2,tmp3,tmp3,tmp2   dead: 0 2 3 4 5  pref=none,0xffff

is translated to:

    addl     %ebx, %r12d
    adcl     %r12d, %ebx

Introduce a new C_N1_O1_I4 constraint, and make sure that earlyclobber
of aliased outputs is honored.

Cc: qemu-stable@nongnu.org
Fixes: 82790a8709 ("tcg: Add markup for output requires new register")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230719221310.1968845-7-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2023-07-23 17:58:19 +01:00
Richard Henderson 965d5d0681 tcg/i386: Support avx512vbmi2 vector shift-double instructions 
We will use VPSHLD, VPSHLDV and VPSHRDV for 16-bit rotates.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2022-03-04 08:50:41 -10:00
Richard Henderson 4c22e84088 tcg/i386: Split out constraint sets to tcg-target-con-set.h 
This exports the constraint sets from tcg_target_op_def to
a place we will be able to manipulate more in future.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2021-02-02 12:12:43 -10:00