7092

1 files changed, 519 insertions, 0 deletions

diff --git a/022float.cc b/022float.cc
new file mode 100644
index 00000000..178e86b3
--- /dev/null
+++ b/022float.cc
@@ -0,0 +1,519 @@
+//: floating-point operations
+
+//:: copy
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "10", "copy xm32 to x32 (movss)");
+put_new(Name_f3_0f, "11", "copy x32 to xm32 (movss)");
+
+:(code)
+void test_copy_x32_to_x32() {
+  Xmm[3] = 0.5;
+  run(
+      "== code 0x1\n"  // code segment
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 11 d8                                    \n"  // copy XMM3 to XMM0
+      // ModR/M in binary: 11 (direct mode) 011 (src XMM3) 000 (dest XMM0)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: copy XMM3 to x/m32\n"
+      "run: x/m32 is XMM0\n"
+      "run: storing 0.5\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x10: {  // copy x/m32 to x32
+  const uint8_t modrm = next();
+  const uint8_t rdest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "copy x/m32 to " << Xname[rdest] << end();
+  float* src = effective_address_float(modrm);
+  Xmm[rdest] = *src;  // Write multiple elements of vector<uint8_t> at once. Assumes sizeof(float) == 4 on the host as well.
+  trace(Callstack_depth+1, "run") << "storing " << Xmm[rdest] << end();
+  break;
+}
+case 0x11: {  // copy x32 to x/m32
+  const uint8_t modrm = next();
+  const uint8_t rsrc = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "copy " << Xname[rsrc] << " to x/m32" << end();
+  float* dest = effective_address_float(modrm);
+  *dest = Xmm[rsrc];  // Write multiple elements of vector<uint8_t> at once. Assumes sizeof(float) == 4 on the host as well.
+  trace(Callstack_depth+1, "run") << "storing " << *dest << end();
+  break;
+}
+
+:(code)
+void test_copy_x32_to_mem_at_xm32() {
+  Xmm[3] = 0.5;
+  Reg[EAX].i = 0x60;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 11 18                                    \n"  // copy XMM3 to *EAX
+      // ModR/M in binary: 00 (indirect mode) 011 (src XMM3) 000 (dest EAX)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: copy XMM3 to x/m32\n"
+      "run: effective address is 0x00000060 (EAX)\n"
+      "run: storing 0.5\n"
+  );
+}
+
+void test_copy_mem_at_xm32_to_x32() {
+  Reg[EAX].i = 0x2000;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 10 18                                    \n"  // copy *EAX to XMM3
+      "== data 0x2000\n"
+      "00 00 00 3f\n"  // 0x3f000000 = 0.5
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: copy x/m32 to XMM3\n"
+      "run: effective address is 0x00002000 (EAX)\n"
+      "run: storing 0.5\n"
+  );
+}
+
+//:: convert to floating point
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "2a", "convert integer to floating-point (cvtsi2ss)");
+
+:(code)
+void test_cvtsi2ss() {
+  Reg[EAX].i = 10;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 2a c0                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 000 (EAX)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: convert r/m32 to XMM0\n"
+      "run: r/m32 is EAX\n"
+      "run: XMM0 is now 10\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x2a: {  // convert integer to float
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "convert r/m32 to " << Xname[dest] << end();
+  const int32_t* src = effective_address(modrm);
+  Xmm[dest] = *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: convert floating point to int
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "2d", "convert floating-point to int (cvtss2si)");
+put_new(Name_f3_0f, "2c", "truncate floating-point to int (cvttss2si)");
+
+:(code)
+void test_cvtss2si() {
+  Xmm[0] = 9.8;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 2d c0                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (EAX) 000 (XMM0)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: convert x/m32 to EAX\n"
+      "run: x/m32 is XMM0\n"
+      "run: EAX is now 0x0000000a\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x2d: {  // convert float to integer
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "convert x/m32 to " << rname(dest) << end();
+  const float* src = effective_address_float(modrm);
+  Reg[dest].i = round(*src);
+  trace(Callstack_depth+1, "run") << rname(dest) << " is now 0x" << HEXWORD << Reg[dest].i << end();
+  break;
+}
+
+:(code)
+void test_cvttss2si() {
+  Xmm[0] = 9.8;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 2c c0                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (EAX) 000 (XMM0)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: truncate x/m32 to EAX\n"
+      "run: x/m32 is XMM0\n"
+      "run: EAX is now 0x00000009\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x2c: {  // truncate float to integer
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "truncate x/m32 to " << rname(dest) << end();
+  const float* src = effective_address_float(modrm);
+  Reg[dest].i = trunc(*src);
+  trace(Callstack_depth+1, "run") << rname(dest) << " is now 0x" << HEXWORD << Reg[dest].i << end();
+  break;
+}
+
+//:: add
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "58", "add floats (addss)");
+
+:(code)
+void test_addss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 58 c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: add x/m32 to XMM0\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 5\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x58: {  // add x/m32 to x32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "add x/m32 to " << Xname[dest] << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] += *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: subtract
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "5c", "subtract floats (subss)");
+
+:(code)
+void test_subss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 5c c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: subtract x/m32 from XMM0\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 1\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x5c: {  // subtract x/m32 from x32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "subtract x/m32 from " << Xname[dest] << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] -= *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: multiply
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "59", "multiply floats (mulss)");
+
+:(code)
+void test_mulss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 59 c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: multiply XMM0 by x/m32\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 6\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x59: {  // multiply x32 by x/m32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "multiply " << Xname[dest] << " by x/m32" << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] *= *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: divide
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "5e", "divide floats (divss)");
+
+:(code)
+void test_divss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 5e c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: divide XMM0 by x/m32\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 1.5\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x5e: {  // divide x32 by x/m32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "divide " << Xname[dest] << " by x/m32" << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] /= *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: min
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "5d", "minimum of two floats (minss)");
+
+:(code)
+void test_minss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 5d c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: minimum of XMM0 and x/m32\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 2\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x5d: {  // minimum of x32, x/m32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "minimum of " << Xname[dest] << " and x/m32" << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] = min(Xmm[dest], *src);
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: max
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "5f", "maximum of two floats (maxss)");
+
+:(code)
+void test_maxss() {
+  Xmm[0] = 3.0;
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 5f c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: maximum of XMM0 and x/m32\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 3\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x5f: {  // maximum of x32, x/m32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "maximum of " << Xname[dest] << " and x/m32" << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] = max(Xmm[dest], *src);
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: reciprocal
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "53", "reciprocal of float (rcpss)");
+
+:(code)
+void test_rcpss() {
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 53 c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: reciprocal of x/m32 into XMM0\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 0.5\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x53: {  // reciprocal of x/m32 into x32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "reciprocal of x/m32 into " << Xname[dest] << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] = 1.0 / *src;
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+//:: square root
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "51", "square root of float (sqrtss)");
+
+:(code)
+void test_sqrtss() {
+  Xmm[1] = 2.0;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 51 c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: square root of x/m32 into XMM0\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 1.41421\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x51: {  // square root of x/m32 into x32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "square root of x/m32 into " << Xname[dest] << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] = sqrt(*src);
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+:(before "End Includes")
+#include <math.h>
+
+//:: inverse square root
+
+:(before "End Initialize Op Names")
+put_new(Name_f3_0f, "52", "inverse square root of float (rsqrtss)");
+
+:(code)
+void test_rsqrtss() {
+  Xmm[1] = 0.01;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "f3 0f 52 c1                                    \n"
+      // ModR/M in binary: 11 (direct mode) 000 (XMM0) 001 (XMM1)
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: inverse square root of x/m32 into XMM0\n"
+      "run: x/m32 is XMM1\n"
+      "run: XMM0 is now 10\n"
+  );
+}
+
+:(before "End Three-Byte Opcodes Starting With f3 0f")
+case 0x52: {  // inverse square root of x/m32 into x32
+  const uint8_t modrm = next();
+  const uint8_t dest = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "inverse square root of x/m32 into " << Xname[dest] << end();
+  const float* src = effective_address_float(modrm);
+  Xmm[dest] = 1.0 / sqrt(*src);
+  trace(Callstack_depth+1, "run") << Xname[dest] << " is now " << Xmm[dest] << end();
+  break;
+}
+
+:(code)
+float* effective_address_float(uint8_t modrm) {
+  const uint8_t mod = (modrm>>6);
+  // ignore middle 3 'reg opcode' bits
+  const uint8_t rm = modrm & 0x7;
+  if (mod == 3) {
+    // mod 3 is just register direct addressing
+    trace(Callstack_depth+1, "run") << "x/m32 is " << Xname[rm] << end();
+    return &Xmm[rm];
+  }
+  uint32_t addr = effective_address_number(modrm);
+  trace(Callstack_depth+1, "run") << "effective address contains " << read_mem_f32(addr) << end();
+  return mem_addr_f32(addr);
+}
+
+//: compare
+
+:(before "End Initialize Op Names")
+put_new(Name_0f, "2f", "compare: set SF if x32 < xm32 (comiss)");
+
+:(code)
+void test_compare_x32_with_mem_at_rm32() {
+  Reg[EAX].i = 0x2000;
+  Xmm[3] = 0.5;
+  run(
+      "== code 0x1\n"
+      // op     ModR/M  SIB   displacement  immediate
+      "  0f 2f  18                                    \n"  // compare XMM3 with *EAX
+      // ModR/M in binary: 00 (indirect mode) 011 (lhs XMM3) 000 (rhs EAX)
+      "== data 0x2000\n"
+      "00 00 00 00\n"  // 0x00000000 = 0.0
+  );
+  CHECK_TRACE_CONTENTS(
+      "run: compare XMM3 with x/m32\n"
+      "run: effective address is 0x00002000 (EAX)\n"
+      "run: SF=0; ZF=0; CF=0; OF=0\n"
+  );
+}
+
+:(before "End Two-Byte Opcodes Starting With 0f")
+case 0x2f: {  // set SF if x32 < x/m32
+  const uint8_t modrm = next();
+  const uint8_t reg1 = (modrm>>3)&0x7;
+  trace(Callstack_depth+1, "run") << "compare " << Xname[reg1] << " with x/m32" << end();
+  const float* arg2 = effective_address_float(modrm);
+  // Flag settings carefully copied from the Intel manual.
+  // See also https://stackoverflow.com/questions/7057501/x86-assembler-floating-point-compare/7057771#7057771
+  SF = ZF = CF = OF = false;
+  if (Xmm[reg1] == *arg2) ZF = true;
+  if (Xmm[reg1] < *arg2) CF = true;
+  trace(Callstack_depth+1, "run") << "SF=" << SF << "; ZF=" << ZF << "; CF=" << CF << "; OF=" << OF << end();
+  break;
+}