We have -- or will have -- several targets which have a native
multiply-highpart instruction: ppc*, ia64, aarch64, alpha.
If we leave only the mul[us]2 opcode with which to expose this,
we have to handle the register allocation bits in the backends.
Better, IMO, to expose the two parts at the TCG opcode level,
simplifying the backends.
I've left tcg_gen_mul[us]_i{32,64} as the "public" interface to
these opcodes at the translator level. If the guest does not
need both results, they can just be ignored. If the host has a
combined mult insn (i386, arm) then one output is garbage; if
the host has separate mult insns, then the optimizer can delete
the unused opcode.
Really only tested with x86_64 and ppc64.
The linux-user-test image for alpha sees:
IN:
0x0000004000814148: umulh t5,t0,t0
OP:
ld_i32 tmp0,env,$0xffffffffffffffa8
movi_i32 tmp1,$0x0
brcond_i32 tmp0,tmp1,ne,$0x0
---- 0x4000814148
mul_i64 tmp3,ir6,ir1
muluh_i64 ir1,ir6,ir1
mov_i64 tmp2,tmp3
movi_i64 pc,$0x400081414c
exit_tb $0x0
set_label $0x0
exit_tb $0x3fff8c244483
OP after optimization and liveness analysis:
ld_i32 tmp0,env,$0xffffffffffffffa8
movi_i32 tmp1,$0x0
brcond_i32 tmp0,tmp1,ne,$0x0
---- 0x4000814148
nopn $0x3,$0xd,$0x3
muluh_i64 ir1,ir1,ir6
nopn $0x2,$0x2
movi_i64 pc,$0x400081414c
exit_tb $0x0
set_label $0x0
exit_tb $0x3fff8c244483
end
OUT: [size=76]
0x6011b0f0: lwz r14,-88(r27)
0x6011b0f4: cmpwi cr7,r14,0
0x6011b0f8: bne- cr7,0x6011b128
0x6011b0fc: ld r14,8(r27)
0x6011b100: ld r15,48(r27)
0x6011b104: mulhdu r14,r14,r15
0x6011b108: std r14,8(r27)
...
r~
Richard Henderson (4):
tcg: Add muluh and mulsh opcodes
tcg-mips: Implement mulsh, muluh
tcg-ppc64: Implement muluh, mulsh
tcg: Constant fold div, rem
tcg/aarch64/tcg-target.h | 4 ++++
tcg/arm/tcg-target.h | 2 ++
tcg/hppa/tcg-target.h | 2 ++
tcg/i386/tcg-target.h | 4 ++++
tcg/ia64/tcg-target.h | 4 ++++
tcg/mips/tcg-target.c | 10 ++++++++++
tcg/mips/tcg-target.h | 2 ++
tcg/optimize.c | 43 +++++++++++++++++++++++++++++++++++++++++++
tcg/ppc/tcg-target.h | 2 ++
tcg/ppc64/tcg-target.c | 32 +++++++-------------------------
tcg/ppc64/tcg-target.h | 8 ++++++--
tcg/s390/tcg-target.h | 4 ++++
tcg/sparc/tcg-target.h | 4 ++++
tcg/tcg-op.h | 40 ++++++++++++++++++++++++++++++++++++----
tcg/tcg-opc.h | 4 ++++
tcg/tcg.c | 36 ++++++++++++++++++++++++++++++------
tcg/tcg.h | 2 ++
tcg/tci/tcg-target.h | 5 ++++-
18 files changed, 170 insertions(+), 38 deletions(-)
--
1.8.1.4
