implement flag push/pop

Author: RSDuck

catnip/x64assembler.nim

@@ -1029,3 +1029,15 @@ genAssembler shufps:
     (regXmm, rmXmm, imm8): (rex, 0x0F, 0xC6, modrm(rm, reg), imm8)
 genAssembler shufpd:
     (regXmm, rmXmm, imm8): (0x66, rex, 0x0F, 0xC6, modrm(rm, reg), imm8)
+
+genAssembler pushf:
+    (): (op16, 0x9C)
+
+genAssembler pushfq:
+    (): (0x9C)
+
+genAssembler popf:
+    (): (op16, 0x9D)
+
+genAssembler popfq:
+    (): (0x9D)

tests/test1.nim

@@ -342,18 +342,30 @@ proc main =
         s.jcc(condNotZero, funcStart)
         s.ret()
 
-    s.movbe(regAx, memMemOnly(regRax))
+    s.movbe(regR15w, memMemOnly(regRax))
     s.movbe(regAx, memMemOnly(regR15))
     s.movbe(regEax, memMemOnly(regRax))
     s.movbe(regEax, memMemOnly(regR15))
     s.movbe(regRax, memMemOnly(regRax))
     s.movbe(regRax, memMemOnly(regR15))
-    s.movbe(memMemOnly(regRax), regAx)
-    s.movbe(memMemOnly(regR15), regAx)
-    s.movbe(memMemOnly(regRax), regEax)
-    s.movbe(memMemOnly(regR15), regEax)
-    s.movbe(memMemOnly(regRax), regRax)
-    s.movbe(memMemOnly(regR15), regRax)
+    s.movbe(regAx, memMemOnly(regRax, regRax))
+    s.movbe(regR12w, memMemOnly(regR15, regRbp))
+    s.movbe(regAx, memMemOnly(regR15, regRax))
+    s.movbe(regEax, memMemOnly(regRax, regRax))
+    s.movbe(regEax, memMemOnly(regR15, regRax))
+    s.movbe(regRax, memMemOnly(regRax, regRax))
+    s.movbe(regRax, memMemOnly(regR15, regRax))
+    s.movbe(memMemOnly(regRax, regRax), regAx)
+    s.movbe(memMemOnly(regRax, regR15), regAx)
+    s.movbe(memMemOnly(regRax, regRax), regEax)
+    s.movbe(memMemOnly(regRax, regR15), regEax)
+    s.movbe(memMemOnly(regRax, regRax), regRax)
+    s.movbe(memMemOnly(regRax, regR15), regRax)
+
+    s.pushf()
+    s.pushfq()
+    s.popf()
+    s.popfq()
 
     let stream = newFileStream("assembled.bin", fmWrite)
     stream.writeData(addr data[0], s.offset)