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Add Intel encodings for ifcmp_imm.

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The instruction set has variants with 8-bit and 32-bit signed immediate
operands.

Add a TODO to use a TEST instruction for the special case ifcmp_imm x, 0.
This commit is contained in:
Jakob Stoklund Olesen
2018-02-13 10:37:26 -08:00
parent 788a78caf4
commit 60e70da0e6
4 changed files with 55 additions and 0 deletions
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3
lib/cretonne/meta/isa/intel/encodings.py
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@@ -363,6 +363,9 @@ I64.enc(base.trapif, r.trapif, 0)
#
enc_i32_i64(base.icmp, r.icscc, 0x39)
enc_i32_i64(base.ifcmp, r.rcmp, 0x39)
enc_i32_i64(base.ifcmp_imm, r.rcmpib, 0x83, rrr=7)
enc_i32_i64(base.ifcmp_imm, r.rcmpid, 0x81, rrr=7)
# TODO: We could special-case ifcmp_imm(x, 0) to TEST(x, x).
I32.enc(base.ifcmp_sp.i32, *r.rcmp_sp(0x39))
I64.enc(base.ifcmp_sp.i64, *r.rcmp_sp.rex(0x39, w=1))

22
lib/cretonne/meta/isa/intel/recipes.py
View File

@@ -1081,6 +1081,28 @@ fcmp = TailRecipe(
modrm_rr(in_reg1, in_reg0, sink);
''')
# XX /n, MI form with imm8.
rcmpib = TailRecipe(
'rcmpib', BinaryImm, size=2, ins=GPR, outs=FLAG.eflags,
instp=IsSignedInt(BinaryImm.imm, 8),
emit='''
PUT_OP(bits, rex1(in_reg0), sink);
modrm_r_bits(in_reg0, bits, sink);
let imm: i64 = imm.into();
sink.put1(imm as u8);
''')
# XX /n, MI form with imm32.
rcmpid = TailRecipe(
'rcmpid', BinaryImm, size=5, ins=GPR, outs=FLAG.eflags,
instp=IsSignedInt(BinaryImm.imm, 32),
emit='''
PUT_OP(bits, rex1(in_reg0), sink);
modrm_r_bits(in_reg0, bits, sink);
let imm: i64 = imm.into();
sink.put4(imm as u32);
''')
# Same as rcmp, but second operand is the stack pointer.
rcmp_sp = TailRecipe(
'rcmp_sp', Unary, size=1, ins=GPR, outs=FLAG.eflags,