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https://github.com/c64scene-ar/llvm-6502.git
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Add MI-Sched support for x86 macro fusion.
This is an awful implementation of the target hook. But we don't have abstractions yet for common machine ops, and I don't see any quick way to make it table-driven. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
parent
6959f08f44
commit
0f2eec65fb
@ -4647,6 +4647,167 @@ bool X86InstrInfo::shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
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return true;
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}
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bool X86InstrInfo::shouldScheduleAdjacent(MachineInstr* First,
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MachineInstr *Second) const {
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// Check if this processor supports macro-fusion. Since this is a minor
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// heuristic, we haven't specifically reserved a feature. hasAVX is a decent
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// proxy for SandyBridge+.
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if (!TM.getSubtarget<X86Subtarget>().hasAVX())
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return false;
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enum {
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FuseTest,
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FuseCmp,
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FuseInc
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} FuseKind;
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switch(Second->getOpcode()) {
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default:
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return false;
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case X86::JE_4:
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case X86::JNE_4:
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case X86::JL_4:
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case X86::JLE_4:
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case X86::JG_4:
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case X86::JGE_4:
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FuseKind = FuseInc;
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break;
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case X86::JB_4:
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case X86::JBE_4:
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case X86::JA_4:
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case X86::JAE_4:
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FuseKind = FuseCmp;
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break;
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case X86::JS_4:
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case X86::JNS_4:
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case X86::JP_4:
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case X86::JNP_4:
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case X86::JO_4:
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case X86::JNO_4:
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FuseKind = FuseTest;
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break;
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}
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switch (First->getOpcode()) {
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default:
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return false;
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case X86::TEST8rr:
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case X86::TEST16rr:
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case X86::TEST32rr:
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case X86::TEST64rr:
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case X86::TEST8ri:
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case X86::TEST16ri:
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case X86::TEST32ri:
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case X86::TEST32i32:
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case X86::TEST64i32:
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case X86::TEST64ri32:
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case X86::TEST8rm:
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case X86::TEST16rm:
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case X86::TEST32rm:
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case X86::TEST64rm:
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case X86::AND16i16:
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case X86::AND16ri:
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case X86::AND16ri8:
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case X86::AND16rm:
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case X86::AND16rr:
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case X86::AND32i32:
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case X86::AND32ri:
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case X86::AND32ri8:
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case X86::AND32rm:
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case X86::AND32rr:
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case X86::AND64i32:
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case X86::AND64ri32:
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case X86::AND64ri8:
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case X86::AND64rm:
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case X86::AND64rr:
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case X86::AND8i8:
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case X86::AND8ri:
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case X86::AND8rm:
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case X86::AND8rr:
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return true;
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case X86::CMP16i16:
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case X86::CMP16ri:
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case X86::CMP16ri8:
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case X86::CMP16rm:
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case X86::CMP16rr:
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case X86::CMP32i32:
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case X86::CMP32ri:
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case X86::CMP32ri8:
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case X86::CMP32rm:
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case X86::CMP32rr:
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case X86::CMP64i32:
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case X86::CMP64ri32:
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case X86::CMP64ri8:
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case X86::CMP64rm:
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case X86::CMP64rr:
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case X86::CMP8i8:
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case X86::CMP8ri:
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case X86::CMP8rm:
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case X86::CMP8rr:
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case X86::ADD16i16:
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case X86::ADD16ri:
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case X86::ADD16ri8:
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case X86::ADD16ri8_DB:
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case X86::ADD16ri_DB:
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case X86::ADD16rm:
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case X86::ADD16rr:
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case X86::ADD16rr_DB:
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case X86::ADD32i32:
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case X86::ADD32ri:
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case X86::ADD32ri8:
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case X86::ADD32ri8_DB:
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case X86::ADD32ri_DB:
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case X86::ADD32rm:
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case X86::ADD32rr:
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case X86::ADD32rr_DB:
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case X86::ADD64i32:
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case X86::ADD64ri32:
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case X86::ADD64ri32_DB:
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case X86::ADD64ri8:
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case X86::ADD64ri8_DB:
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case X86::ADD64rm:
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case X86::ADD64rr:
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case X86::ADD64rr_DB:
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case X86::ADD8i8:
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case X86::ADD8mi:
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case X86::ADD8mr:
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case X86::ADD8ri:
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case X86::ADD8rm:
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case X86::ADD8rr:
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case X86::SUB16i16:
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case X86::SUB16ri:
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case X86::SUB16ri8:
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case X86::SUB16rm:
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case X86::SUB16rr:
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case X86::SUB32i32:
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case X86::SUB32ri:
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case X86::SUB32ri8:
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case X86::SUB32rm:
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case X86::SUB32rr:
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case X86::SUB64i32:
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case X86::SUB64ri32:
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case X86::SUB64ri8:
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case X86::SUB64rm:
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case X86::SUB64rr:
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case X86::SUB8i8:
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case X86::SUB8ri:
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case X86::SUB8rm:
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case X86::SUB8rr:
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return FuseKind == FuseCmp || FuseKind == FuseInc;
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case X86::INC16r:
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case X86::INC32r:
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case X86::INC64_16r:
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case X86::INC64_32r:
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case X86::INC64r:
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case X86::INC8r:
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case X86::DEC16r:
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case X86::DEC32r:
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case X86::DEC64_16r:
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case X86::DEC64_32r:
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case X86::DEC64r:
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case X86::DEC8r:
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return FuseKind == FuseInc;
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}
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}
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bool X86InstrInfo::
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ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
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@ -339,6 +339,9 @@ public:
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int64_t Offset1, int64_t Offset2,
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unsigned NumLoads) const;
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virtual bool shouldScheduleAdjacent(MachineInstr* First,
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MachineInstr *Second) const LLVM_OVERRIDE;
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virtual void getNoopForMachoTarget(MCInst &NopInst) const;
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virtual
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108
test/CodeGen/X86/misched-fusion.ll
Normal file
108
test/CodeGen/X86/misched-fusion.ll
Normal file
@ -0,0 +1,108 @@
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; RUN: llc < %s -march=x86-64 -mcpu=corei7-avx -disable-lsr -pre-RA-sched=source -enable-misched -verify-machineinstrs | FileCheck %s
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; Verify that TEST+JE are scheduled together.
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; CHECK: test_je
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; CHECK: %loop
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; CHECK: test
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; CHECK-NEXT: je
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define void @test_je() {
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entry:
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br label %loop
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loop:
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%var = phi i32* [ null, %entry ], [ %next.load, %loop1 ], [ %var, %loop2 ]
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%next.ptr = phi i32** [ null, %entry ], [ %next.ptr, %loop1 ], [ %gep, %loop2 ]
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br label %loop1
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loop1:
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%cond = icmp eq i32* %var, null
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%next.load = load i32** %next.ptr
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br i1 %cond, label %loop, label %loop2
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loop2: ; preds = %loop1
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%gep = getelementptr inbounds i32** %next.ptr, i32 1
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store i32* %next.load, i32** undef
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br label %loop
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}
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; Verify that DEC+JE are scheduled together.
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; CHECK: dec_je
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; CHECK: %loop1
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; CHECK: dec
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; CHECK-NEXT: je
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define void @dec_je() {
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entry:
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br label %loop
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loop:
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%var = phi i32 [ 0, %entry ], [ %next.var, %loop1 ], [ %var2, %loop2 ]
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%next.ptr = phi i32** [ null, %entry ], [ %next.ptr, %loop1 ], [ %gep, %loop2 ]
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br label %loop1
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loop1:
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%var2 = sub i32 %var, 1
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%cond = icmp eq i32 %var2, 0
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%next.load = load i32** %next.ptr
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%next.var = load i32* %next.load
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br i1 %cond, label %loop, label %loop2
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loop2:
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%gep = getelementptr inbounds i32** %next.ptr, i32 1
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store i32* %next.load, i32** undef
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br label %loop
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}
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; DEC+JS should *not* be scheduled together.
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; CHECK: dec_js
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; CHECK: %loop1
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; CHECK: dec
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; CHECK: mov
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; CHECK: js
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define void @dec_js() {
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entry:
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br label %loop2a
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loop2a: ; preds = %loop1, %body, %entry
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%var = phi i32 [ 0, %entry ], [ %next.var, %loop1 ], [ %var2, %loop2b ]
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%next.ptr = phi i32** [ null, %entry ], [ %next.ptr, %loop1 ], [ %gep, %loop2b ]
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br label %loop1
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loop1: ; preds = %loop2a, %loop2b
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%var2 = sub i32 %var, 1
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%cond = icmp slt i32 %var2, 0
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%next.load = load i32** %next.ptr
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%next.var = load i32* %next.load
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br i1 %cond, label %loop2a, label %loop2b
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loop2b: ; preds = %loop1
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%gep = getelementptr inbounds i32** %next.ptr, i32 1
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store i32* %next.load, i32** undef
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br label %loop2a
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}
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; Verify that CMP+JB are scheduled together.
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; CHECK: cmp_jb
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; CHECK: %loop1
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; CHECK: cmp
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; CHECK-NEXT: jb
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define void @cmp_jb(i32 %n) {
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entry:
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br label %loop2a
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loop2a: ; preds = %loop1, %body, %entry
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%var = phi i32 [ 0, %entry ], [ %next.var, %loop1 ], [ %var2, %loop2b ]
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%next.ptr = phi i32** [ null, %entry ], [ %next.ptr, %loop1 ], [ %gep, %loop2b ]
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br label %loop1
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loop1: ; preds = %loop2a, %loop2b
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%var2 = sub i32 %var, 1
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%cond = icmp ult i32 %var2, %n
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%next.load = load i32** %next.ptr
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%next.var = load i32* %next.load
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br i1 %cond, label %loop2a, label %loop2b
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loop2b: ; preds = %loop1
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%gep = getelementptr inbounds i32** %next.ptr, i32 1
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store i32* %next.load, i32** undef
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br label %loop2a
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}
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