Subzero: Improve x86-32's implementation of getGprForType().

src/IceTargetLoweringX8664Traits.h

 //===- subzero/src/IceTargetLoweringX8664Traits.h - x86-64 traits -*- C++ -*-=//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 419 matching lines @@
     switch (RegNum) {
     default:
       llvm::report_fatal_error("Unknown register.");
 #define X(val, encode, name, base, scratch, preserved, stackptr, frameptr,     \
           sboxres, isGPR, is64, is32, is16, is8, isXmm, is64To8, is32To8,      \
           is16To8, isTrunc8Rcvr, isAhRcvr, aliases)                            \
   case RegisterSet::val: {                                                     \
     if (!isGPR)                                                                \
       return RegisterSet::val;                                                 \
     assert((is64) || (is32) || (is16) || (is8) ||                              \
-           getBaseReg(RegisterSet::val) == RegisterSet::Reg_rsp ||             \
-           getBaseReg(RegisterSet::val) == RegisterSet::Reg_rbp);              \
+           getBaseReg(RegisterSet::val) == RegisterSet::Reg_rsp);              \
     constexpr int32_t FirstGprWithRegNumSize =                                 \
-        ((is64) || RegisterSet::val == RegisterSet::Reg_rsp ||                 \
-         RegisterSet::val == RegisterSet::Reg_rbp)                             \
+        ((is64) || RegisterSet::val == RegisterSet::Reg_rsp)                   \
             ? RegisterSet::Reg_rax                                             \
-            : (((is32) || RegisterSet::val == RegisterSet::Reg_esp ||          \
-                RegisterSet::val == RegisterSet::Reg_ebp)                      \
+            : (((is32) || RegisterSet::val == RegisterSet::Reg_esp)            \
                    ? RegisterSet::Reg_eax                                      \
-                   : (((is16) || RegisterSet::val == RegisterSet::Reg_sp ||    \
-                       RegisterSet::val == RegisterSet::Reg_bp)                \
+                   : (((is16) || RegisterSet::val == RegisterSet::Reg_sp)      \
                           ? RegisterSet::Reg_ax                                \
                           : RegisterSet::Reg_al));                             \
     const int32_t NewRegNum =                                                  \
         RegNum - FirstGprWithRegNumSize + FirstGprForType;                     \
     assert(getBaseReg(RegNum) == getBaseReg(NewRegNum) &&                      \
            "Error involving " #val);                                           \
     return NewRegNum;                                                          \
   }
       REGX8664_TABLE
 #undef X
@@ skipping 584 matching lines @@
     const char *FldString;   // s, l, or <blank>
   } TypeAttributes[];
 };
 
 using Traits = ::Ice::X8664::TargetX8664Traits;
 } // end of namespace X8664
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8664TRAITS_H