ART: Implement hard float for X86

Use XMM0-XMM3 as parameter registers for float/double on X86.  X86_64
already uses XMM0-XMM7 for parameters.

Change the 'hidden' argument register from XMM0 to XMM7 to avoid a
conflict.

This change was requested to simplify the Optimizing compiler
implementation.

Change-Id: I89ba8ade99b9a8a5b1ad1ee5f5cbfd33d656bfaa
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 9db1646f5f..87dd79015c 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -145,14 +145,18 @@ class QuickArgumentVisitor {
   // | EBX         |    arg3
   // | EDX         |    arg2
   // | ECX         |    arg1
+  // | XMM3        |    float arg 4
+  // | XMM2        |    float arg 3
+  // | XMM1        |    float arg 2
+  // | XMM0        |    float arg 1
   // | EAX/Method* |  <- sp
-  static constexpr bool kQuickSoftFloatAbi = true;  // This is a soft float ABI.
+  static constexpr bool kQuickSoftFloatAbi = false;  // This is a hard float ABI.
   static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false;
   static constexpr size_t kNumQuickGprArgs = 3;  // 3 arguments passed in GPRs.
-  static constexpr size_t kNumQuickFprArgs = 0;  // 0 arguments passed in FPRs.
-  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0;  // Offset of first FPR arg.
-  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4;  // Offset of first GPR arg.
-  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28;  // Offset of return address.
+  static constexpr size_t kNumQuickFprArgs = 4;  // 4 arguments passed in FPRs.
+  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 4;  // Offset of first FPR arg.
+  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4 + 4*8;  // Offset of first GPR arg.
+  static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28 + 4*8;  // Offset of return address.
   static size_t GprIndexToGprOffset(uint32_t gpr_index) {
     return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA);
   }