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-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa4
-rw-r--r--src/arch/x86/isa/insts/string/compare_strings.py70
2 files changed, 59 insertions, 15 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index ee7fbc683..d8db47063 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -332,8 +332,8 @@
0x3: mov_Ov_rAX();
0x4: movs_Yb_Xb();
0x5: movs_Yv_Xv();
- 0x6: cmps_Yb_Xb();
- 0x7: cmps_Yv_Xv();
+ 0x6: StringInst::CMPS(Yb,Xb);
+ 0x7: StringInst::CMPS(Yv,Xv);
}
0x15: decode OPCODE_OP_BOTTOM3 {
0x0: Inst::TEST(rAb,Ib);
diff --git a/src/arch/x86/isa/insts/string/compare_strings.py b/src/arch/x86/isa/insts/string/compare_strings.py
index 1484c4706..71b8511b4 100644
--- a/src/arch/x86/isa/insts/string/compare_strings.py
+++ b/src/arch/x86/isa/insts/string/compare_strings.py
@@ -53,16 +53,60 @@
#
# Authors: Gabe Black
-microcode = ""
-#let {{
-# class CMPS(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPSB(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPSW(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPSD(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPSQ(Inst):
-# "GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop CMPS_M_M {
+ # Find the constant we need to either add or subtract from rdi
+ ruflag t0, 10
+ movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+ subi t4, t0, dsz, dataSize=asz
+ mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+ ld t1, seg, [1, t0, rsi]
+ ld t2, es, [1, t0, rdi]
+ sub t0, t1, t2, flags=(OF, SF, ZF, AF, PF, CF)
+
+ add rdi, rdi, t3, dataSize=asz
+ add rsi, rsi, t3, dataSize=asz
+};
+
+#
+# Versions which have the rep prefix. These could benefit from some loop
+# unrolling.
+#
+
+def macroop CMPS_E_M_M {
+ # Find the constant we need to either add or subtract from rdi
+ ruflag t0, 10
+ movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+ subi t4, t0, dsz, dataSize=asz
+ mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+ ld t1, seg, [1, t0, rsi]
+ ld t2, es, [1, t0, rdi]
+ sub t0, t1, t2, flags=(OF, SF, ZF, AF, PF, CF)
+
+ subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
+ add rdi, rdi, t3, dataSize=asz
+ add rsi, rsi, t3, dataSize=asz
+ bri t0, 4, flags=(CSTRZnEZF,)
+ fault "NoFault"
+};
+
+def macroop CMPS_N_M_M {
+ # Find the constant we need to either add or subtract from rdi
+ ruflag t0, 10
+ movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+ subi t4, t0, dsz, dataSize=asz
+ mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+ ld t1, seg, [1, t0, rsi]
+ ld t2, es, [1, t0, rdi]
+ sub t0, t1, t2, flags=(OF, SF, ZF, AF, PF, CF)
+
+ subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
+ add rdi, rdi, t3, dataSize=asz
+ add rsi, rsi, t3, dataSize=asz
+ bri t0, 4, flags=(CSTRnZnEZF,)
+ fault "NoFault"
+};
+'''