changeset 4fff54ab52ae in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=4fff54ab52ae
description:
X86: Implement shrd.
diffstat:
2 files changed, 36 insertions(+), 1 deletion(-)
src/arch/x86/isa/decoder/two_byte_opcodes.isa | 2
src/arch/x86/isa/insts/general_purpose/rotate_and_shift/shift.py | 35
++++++++++
diffs (57 lines):
diff -r 536125d85fa3 -r 4fff54ab52ae
src/arch/x86/isa/decoder/two_byte_opcodes.isa
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa Fri Feb 27 09:26:17
2009 -0800
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa Fri Feb 27 09:26:26
2009 -0800
@@ -830,7 +830,7 @@
0x1: pop_gs();
0x2: rsm_smm();
0x3: Inst::BTS(Ev,Gv);
- 0x4: shrd_Ev_Gv_Ib();
+ 0x4: Inst::SHRD(Ev,Gv,Ib);
0x5: shrd_Ev_Gv_rCl();
//0x6: group16();
0x6: decode MODRM_REG {
diff -r 536125d85fa3 -r 4fff54ab52ae
src/arch/x86/isa/insts/general_purpose/rotate_and_shift/shift.py
--- a/src/arch/x86/isa/insts/general_purpose/rotate_and_shift/shift.py Fri Feb
27 09:26:17 2009 -0800
+++ b/src/arch/x86/isa/insts/general_purpose/rotate_and_shift/shift.py Fri Feb
27 09:26:26 2009 -0800
@@ -174,6 +174,41 @@
st t1, seg, riprel, disp
};
+# SHRD will not set OF correctly when the shift count is 1.
+def macroop SHRD_R_R_I
+{
+ srli t1, reg, imm, flags=(CF,)
+ rori t2, regm, imm
+ srli t3, regm, imm
+ xor t2, t2, t3
+ or reg, t1, t2
+};
+
+# SHRD will not set OF correctly when the shift count is 1.
+def macroop SHRD_M_R_I
+{
+ ldst t1, seg, sib, disp
+ srli t1, t1, imm, flags=(CF,)
+ rori t2, reg, imm
+ srli t3, reg, imm
+ xor t2, t2, t3
+ or t1, t1, t2
+ st t1, seg, sib, disp
+};
+
+# SHRD will not set OF correctly when the shift count is 1.
+def macroop SHRD_P_R_I
+{
+ rdip t7
+ ldst t1, seg, riprel, disp
+ srli t1, t1, imm, flags=(CF,)
+ rori t2, reg, imm
+ srli t3, reg, imm
+ xor t2, t2, t3
+ or t1, t1, t2
+ st t1, seg, riprel, disp
+};
+
def macroop SAR_R_I
{
srai reg, reg, imm, flags=(CF,OF,SF,ZF,PF)
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