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c2b840cb7c
When loading immediates into a GR32, the port prefered LHI, followed by LLILH or LLILL, followed by IILF. LHI and IILF are natural 32-bit operations, but LLILH and LLILL also clear the upper 32 bits of the register. This was represented as taking a 32-bit subreg of a 64-bit assignment. Using subregs for something as simple as a move immediate was probably a bad idea. Also, I have patches to add support for the high-word facility, and we don't want something like LLILH and LLILL to stop the high word of the same GPR from being used. This patch therefore uses LHI and IILF to begin with and adds a late machine-specific pass to use LLILH and LLILL if the other half of the register is not live. The high-word patches extend this behavior to IIHF, LLIHL and LLIHH. No behavioral change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191363 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
//==- SystemZ.h - Top-Level Interface for SystemZ representation -*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the entry points for global functions defined in
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// the LLVM SystemZ backend.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SYSTEMZ_H
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#define SYSTEMZ_H
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#include "MCTargetDesc/SystemZMCTargetDesc.h"
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#include "llvm/Support/CodeGen.h"
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namespace llvm {
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class SystemZTargetMachine;
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class FunctionPass;
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namespace SystemZ {
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// Condition-code mask values.
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const unsigned CCMASK_0 = 1 << 3;
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const unsigned CCMASK_1 = 1 << 2;
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const unsigned CCMASK_2 = 1 << 1;
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const unsigned CCMASK_3 = 1 << 0;
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const unsigned CCMASK_ANY = CCMASK_0 | CCMASK_1 | CCMASK_2 | CCMASK_3;
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// Condition-code mask assignments for integer and floating-point
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// comparisons.
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const unsigned CCMASK_CMP_EQ = CCMASK_0;
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const unsigned CCMASK_CMP_LT = CCMASK_1;
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const unsigned CCMASK_CMP_GT = CCMASK_2;
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const unsigned CCMASK_CMP_NE = CCMASK_CMP_LT | CCMASK_CMP_GT;
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const unsigned CCMASK_CMP_LE = CCMASK_CMP_EQ | CCMASK_CMP_LT;
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const unsigned CCMASK_CMP_GE = CCMASK_CMP_EQ | CCMASK_CMP_GT;
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// Condition-code mask assignments for floating-point comparisons only.
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const unsigned CCMASK_CMP_UO = CCMASK_3;
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const unsigned CCMASK_CMP_O = CCMASK_ANY ^ CCMASK_CMP_UO;
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// All condition-code values produced by comparisons.
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const unsigned CCMASK_ICMP = CCMASK_0 | CCMASK_1 | CCMASK_2;
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const unsigned CCMASK_FCMP = CCMASK_0 | CCMASK_1 | CCMASK_2 | CCMASK_3;
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// Condition-code mask assignments for CS.
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const unsigned CCMASK_CS_EQ = CCMASK_0;
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const unsigned CCMASK_CS_NE = CCMASK_1;
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const unsigned CCMASK_CS = CCMASK_0 | CCMASK_1;
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// Condition-code mask assignments for a completed SRST loop.
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const unsigned CCMASK_SRST_FOUND = CCMASK_1;
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const unsigned CCMASK_SRST_NOTFOUND = CCMASK_2;
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const unsigned CCMASK_SRST = CCMASK_1 | CCMASK_2;
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// Condition-code mask assignments for TEST UNDER MASK.
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const unsigned CCMASK_TM_ALL_0 = CCMASK_0;
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const unsigned CCMASK_TM_MIXED_MSB_0 = CCMASK_1;
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const unsigned CCMASK_TM_MIXED_MSB_1 = CCMASK_2;
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const unsigned CCMASK_TM_ALL_1 = CCMASK_3;
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const unsigned CCMASK_TM_SOME_0 = CCMASK_TM_ALL_1 ^ CCMASK_ANY;
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const unsigned CCMASK_TM_SOME_1 = CCMASK_TM_ALL_0 ^ CCMASK_ANY;
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const unsigned CCMASK_TM_MSB_0 = CCMASK_0 | CCMASK_1;
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const unsigned CCMASK_TM_MSB_1 = CCMASK_2 | CCMASK_3;
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const unsigned CCMASK_TM = CCMASK_ANY;
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// Mask assignments for PFD.
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const unsigned PFD_READ = 1;
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const unsigned PFD_WRITE = 2;
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// Return true if Val fits an LLILL operand.
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static inline bool isImmLL(uint64_t Val) {
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return (Val & ~0x000000000000ffffULL) == 0;
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}
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// Return true if Val fits an LLILH operand.
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static inline bool isImmLH(uint64_t Val) {
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return (Val & ~0x00000000ffff0000ULL) == 0;
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}
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// Return true if Val fits an LLIHL operand.
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static inline bool isImmHL(uint64_t Val) {
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return (Val & ~0x00000ffff00000000ULL) == 0;
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}
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// Return true if Val fits an LLIHH operand.
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static inline bool isImmHH(uint64_t Val) {
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return (Val & ~0xffff000000000000ULL) == 0;
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}
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// Return true if Val fits an LLILF operand.
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static inline bool isImmLF(uint64_t Val) {
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return (Val & ~0x00000000ffffffffULL) == 0;
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}
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// Return true if Val fits an LLIHF operand.
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static inline bool isImmHF(uint64_t Val) {
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return (Val & ~0xffffffff00000000ULL) == 0;
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}
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}
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FunctionPass *createSystemZISelDag(SystemZTargetMachine &TM,
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CodeGenOpt::Level OptLevel);
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FunctionPass *createSystemZElimComparePass(SystemZTargetMachine &TM);
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FunctionPass *createSystemZShortenInstPass(SystemZTargetMachine &TM);
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FunctionPass *createSystemZLongBranchPass(SystemZTargetMachine &TM);
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} // end namespace llvm;
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#endif
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