Revert of [Turbofan] CodeGenerator for ARM avoids moves from VFP to general regs.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 7f05fd6903c0cd7067b862cfad9588cb9f2e9d93..de8e14ef53422d6f45a14119ec1f0b87b768fb48 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -1051,151 +1051,66 @@
   }
 }
 
-void MacroAssembler::VmovExtended(int dst_code, int src_code) {
+void MacroAssembler::VmovExtended(Register dst, int src_code) {
+  DCHECK_LE(32, src_code);
+  DCHECK_GT(64, src_code);
+  if (src_code & 0x1) {
+    VmovHigh(dst, DwVfpRegister::from_code(src_code / 2));
+  } else {
+    VmovLow(dst, DwVfpRegister::from_code(src_code / 2));
+  }
+}
+
+void MacroAssembler::VmovExtended(int dst_code, Register src) {
+  DCHECK_LE(32, dst_code);
+  DCHECK_GT(64, dst_code);
+  if (dst_code & 0x1) {
+    VmovHigh(DwVfpRegister::from_code(dst_code / 2), src);
+  } else {
+    VmovLow(DwVfpRegister::from_code(dst_code / 2), src);
+  }
+}
+
+void MacroAssembler::VmovExtended(int dst_code, int src_code,
+                                  Register scratch) {
   if (src_code < 32 && dst_code < 32) {
     // src and dst are both s-registers.
     vmov(SwVfpRegister::from_code(dst_code),
          SwVfpRegister::from_code(src_code));
   } else if (src_code < 32) {
-    // src is s-register, dst is in high d-register. Move dst into scratch
-    // d-register to do the s-register move, then back.
-    DCHECK_GT(64, dst_code);
-    DwVfpRegister dst_reg = DwVfpRegister::from_code(dst_code / 2);
-    int dst_s_code = kScratchDoubleReg.low().code() + (dst_code & 1);
-    vmov(kScratchDoubleReg, dst_reg);
-    vmov(SwVfpRegister::from_code(dst_s_code),
-         SwVfpRegister::from_code(src_code));
-    vmov(dst_reg, kScratchDoubleReg);
+    // src is an s-register.
+    vmov(scratch, SwVfpRegister::from_code(src_code));
+    VmovExtended(dst_code, scratch);
   } else if (dst_code < 32) {
-    // src is in high d-register, dst is an s-register. Move src into scratch
-    // d-register, do the s-register move.
-    DCHECK_GT(64, src_code);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int src_s_code = kScratchDoubleReg.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, src_reg);
-    vmov(SwVfpRegister::from_code(dst_code),
-         SwVfpRegister::from_code(src_s_code));
-  } else {
-    // src and dst are in high d-registers. Move both into free registers,
-    // do the s-register move, then move dst back.
+    // dst is an s-register.
+    VmovExtended(scratch, src_code);
+    vmov(SwVfpRegister::from_code(dst_code), scratch);
+  } else {
+    // Neither src or dst are s-registers.
     DCHECK_GT(64, src_code);
     DCHECK_GT(64, dst_code);
-    DwVfpRegister dst_reg = DwVfpRegister::from_code(dst_code / 2);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int dst_s_code = kScratchDoubleReg.low().code() + (dst_code & 1);
-    int src_s_code = kDoubleRegZero.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, dst_reg);
-    vmov(kDoubleRegZero, src_reg);
-    vmov(SwVfpRegister::from_code(dst_s_code),
-         SwVfpRegister::from_code(src_s_code));
-    vmov(dst_reg, kScratchDoubleReg);
-    vmov(kDoubleRegZero, 0.0);  // restore zero register
-  }
-}
-
-void MacroAssembler::VmovExtended(int dst_code, const MemOperand& src) {
-  if (dst_code < 32) {
+    VmovExtended(scratch, src_code);
+    VmovExtended(dst_code, scratch);
+  }
+}
+
+void MacroAssembler::VmovExtended(int dst_code, const MemOperand& src,
+                                  Register scratch) {
+  if (dst_code >= 32) {
+    ldr(scratch, src);
+    VmovExtended(dst_code, scratch);
+  } else {
     vldr(SwVfpRegister::from_code(dst_code), src);
-  } else {
-    // dst is in high d-register, move it down, load src, then move it back up.
-    DCHECK_GT(64, dst_code);
-    DwVfpRegister dst_reg = DwVfpRegister::from_code(dst_code / 2);
-    int dst_s_code = kScratchDoubleReg.low().code() + (dst_code & 1);
-    vmov(kScratchDoubleReg, dst_reg);
-    vldr(SwVfpRegister::from_code(dst_s_code), src);
-    vmov(dst_reg, kScratchDoubleReg);
-  }
-}
-void MacroAssembler::VmovExtended(const MemOperand& dst, int src_code) {
-  if (src_code < 32) {
+  }
+}
+
+void MacroAssembler::VmovExtended(const MemOperand& dst, int src_code,
+                                  Register scratch) {
+  if (src_code >= 32) {
+    VmovExtended(scratch, src_code);
+    str(scratch, dst);
+  } else {
     vstr(SwVfpRegister::from_code(src_code), dst);
-  } else {
-    // src is in high d-register, move it down, store src.
-    DCHECK_GT(64, src_code);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int src_s_code = kScratchDoubleReg.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, src_reg);
-    vstr(SwVfpRegister::from_code(src_s_code), dst);
-  }
-}
-
-void MacroAssembler::VswpExtended(int dst_code, int src_code) {
-  if (src_code < 32 && dst_code < 32) {
-    // src and dst are both s-registers.
-    vmov(kScratchDoubleReg.low(), SwVfpRegister::from_code(dst_code));
-    vmov(SwVfpRegister::from_code(dst_code),
-         SwVfpRegister::from_code(src_code));
-    vmov(SwVfpRegister::from_code(src_code), kScratchDoubleReg.low());
-  } else if (src_code < 32) {
-    // src is s-register, dst is in high d-register. Move dst into scratch
-    // d-register to do the s-register swap, then back.
-    DCHECK_GT(64, dst_code);
-    DwVfpRegister dst_reg = DwVfpRegister::from_code(dst_code / 2);
-    int dst_s_code = kScratchDoubleReg.low().code() + (dst_code & 1);
-    int dst_s_temp = kDoubleRegZero.low().code() + (dst_code & 1);
-    vmov(kScratchDoubleReg, dst_reg);
-    vmov(kDoubleRegZero, dst_reg);
-    vmov(SwVfpRegister::from_code(dst_s_code),
-         SwVfpRegister::from_code(src_code));
-    vmov(dst_reg, kScratchDoubleReg);
-    vmov(SwVfpRegister::from_code(src_code),
-         SwVfpRegister::from_code(dst_s_temp));
-    vmov(kDoubleRegZero, 0.0);  // restore zero register
-  } else if (dst_code < 32) {
-    // src is in high d-register, dst is an s-register. Move src into scratch
-    // d-register, do the s-register swap.
-    DCHECK_GT(64, src_code);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int src_s_code = kScratchDoubleReg.low().code() + (src_code & 1);
-    int src_s_temp = kDoubleRegZero.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, src_reg);
-    vmov(kDoubleRegZero, src_reg);
-    vmov(SwVfpRegister::from_code(src_s_code),
-         SwVfpRegister::from_code(dst_code));
-    vmov(src_reg, kScratchDoubleReg);
-    vmov(SwVfpRegister::from_code(dst_code),
-         SwVfpRegister::from_code(src_s_temp));
-    vmov(kDoubleRegZero, 0.0);  // restore zero register
-  } else {
-    // src and dst are in high d-registers. Move both into free registers,
-    // do the s-register swap, then move both back.
-    DCHECK_GT(64, src_code);
-    DCHECK_GT(64, dst_code);
-    DwVfpRegister dst_reg = DwVfpRegister::from_code(dst_code / 2);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int dst_s_code = kScratchDoubleReg.low().code() + (dst_code & 1);
-    int src_s_code = kDoubleRegZero.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, dst_reg);
-    vmov(kDoubleRegZero, src_reg);
-    vmov(SwVfpRegister::from_code(src_s_code ^ 1),
-         SwVfpRegister::from_code(dst_s_code));
-    vmov(SwVfpRegister::from_code(dst_s_code),
-         SwVfpRegister::from_code(src_s_code));
-    vmov(dst_reg, kScratchDoubleReg);
-    vmov(kScratchDoubleReg, src_reg);
-    vmov(SwVfpRegister::from_code(dst_s_code),
-         SwVfpRegister::from_code(src_s_code ^ 1));
-    vmov(src_reg, kScratchDoubleReg);
-    vmov(kDoubleRegZero, 0.0);  // restore zero register
-  }
-}
-
-void MacroAssembler::VswpExtended(const MemOperand& dst, int src_code) {
-  if (src_code < 32) {
-    vldr(kScratchDoubleReg.low(), dst);
-    vstr(SwVfpRegister::from_code(src_code), dst);
-    vmov(SwVfpRegister::from_code(src_code), kScratchDoubleReg.low());
-  } else {
-    // src is in high d-register, move it down, do the swap, move src back up.
-    DCHECK_GT(64, src_code);
-    DwVfpRegister src_reg = DwVfpRegister::from_code(src_code / 2);
-    int src_s_code = kScratchDoubleReg.low().code() + (src_code & 1);
-    vmov(kScratchDoubleReg, src_reg);
-    vldr(kDoubleRegZero.low(), dst);
-    vstr(SwVfpRegister::from_code(src_s_code), dst);
-    vmov(SwVfpRegister::from_code(src_s_code), kDoubleRegZero.low());
-    vmov(src_reg, kScratchDoubleReg);
-    vmov(kDoubleRegZero, 0.0);  // restore zero register
   }
 }