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[FastISel][X86] Use XOR to materialize the "0" value.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215594 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3107,6 +3107,29 @@ unsigned X86FastISel::X86MaterializeInt(const ConstantInt *CI, MVT VT) {
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return 0;
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uint64_t Imm = CI->getZExtValue();
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if (Imm == 0) {
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unsigned SrcReg = FastEmitInst_(X86::MOV32r0, &X86::GR32RegClass);
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switch (VT.SimpleTy) {
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default: llvm_unreachable("Unexpected value type");
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case MVT::i1:
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case MVT::i8:
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return FastEmitInst_extractsubreg(MVT::i8, SrcReg, /*Kill=*/true,
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X86::sub_8bit);
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case MVT::i16:
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return FastEmitInst_extractsubreg(MVT::i16, SrcReg, /*Kill=*/true,
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X86::sub_16bit);
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case MVT::i32:
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return SrcReg;
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case MVT::i64: {
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unsigned ResultReg = createResultReg(&X86::GR64RegClass);
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BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
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TII.get(TargetOpcode::SUBREG_TO_REG), ResultReg)
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.addImm(0).addReg(SrcReg).addImm(X86::sub_32bit);
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return ResultReg;
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}
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}
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}
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unsigned Opc = 0;
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switch (VT.SimpleTy) {
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default: llvm_unreachable("Unexpected value type");
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@ -351,7 +351,7 @@ bb1:
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define i32 @icmp_eq(i32 %x) {
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; CHECK-LABEL: icmp_eq
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; CHECK-NOT: cmpl
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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%1 = icmp eq i32 %x, %x
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br i1 %1, label %bb1, label %bb2
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bb2:
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@ -387,7 +387,7 @@ bb1:
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define i32 @icmp_uge(i32 %x) {
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; CHECK-LABEL: icmp_uge
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; CHECK-NOT: cmpl
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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%1 = icmp uge i32 %x, %x
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br i1 %1, label %bb1, label %bb2
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bb2:
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@ -411,7 +411,7 @@ bb1:
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define i32 @icmp_ule(i32 %x) {
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; CHECK-LABEL: icmp_ule
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; CHECK-NOT: cmpl
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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%1 = icmp ule i32 %x, %x
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br i1 %1, label %bb1, label %bb2
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bb2:
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@ -435,7 +435,7 @@ bb1:
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define i32 @icmp_sge(i32 %x) {
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; CHECK-LABEL: icmp_sge
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; CHECK-NOT: cmpl
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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%1 = icmp sge i32 %x, %x
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br i1 %1, label %bb1, label %bb2
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bb2:
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@ -459,7 +459,7 @@ bb1:
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define i32 @icmp_sle(i32 %x) {
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; CHECK-LABEL: icmp_sle
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; CHECK-NOT: cmpl
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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%1 = icmp sle i32 %x, %x
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br i1 %1, label %bb1, label %bb2
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bb2:
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@ -36,11 +36,11 @@ entry:
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store i32 (...)** getelementptr ([4 x i32 (...)*]* @LotsStuff, i32 0, i32 2), i32 (...)*** null, align 4
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ret void
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; CHECK: _t:
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; CHECK: movl $0, %eax
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; CHECK: xorl %eax, %eax
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; CHECK: movl L_LotsStuff$non_lazy_ptr, %ecx
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; ATOM: _t:
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; ATOM: movl L_LotsStuff$non_lazy_ptr, %e{{..}}
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; ATOM: movl $0, %e{{..}}
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; ATOM: xorl %e{{..}}, %e{{..}}
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}
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@ -144,7 +144,7 @@ if.end: ; preds = %if.then, %entry
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; CHECK-LABEL: test12:
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; CHECK: testb $1,
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; CHECK-NEXT: je L
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; CHECK-NEXT: movl $0, %edi
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; CHECK-NEXT: xorl %edi, %edi
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; CHECK-NEXT: callq
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}
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@ -154,7 +154,7 @@ define void @test13() nounwind {
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call void @test13f(i1 0)
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ret void
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; CHECK-LABEL: test13:
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; CHECK: movl $0, %edi
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; CHECK: xorl %edi, %edi
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; CHECK-NEXT: callq
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}
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@ -278,7 +278,7 @@ entry:
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call void @foo22(i32 3)
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ret void
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; CHECK-LABEL: test22:
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; CHECK: movl $0, %edi
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; CHECK: xorl %edi, %edi
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; CHECK: callq _foo22
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; CHECK: movl $1, %edi
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; CHECK: callq _foo22
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@ -25,7 +25,7 @@
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; if they've changed due to a bugfix, change in register allocation, etc.
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; CHECK: [[A]]: Beginning address index: 2
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; CHECK-NEXT: Length: 199
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; CHECK-NEXT: Length: 190
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; CHECK-NEXT: Location description: 11 00
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; CHECK-NEXT: {{^$}}
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; CHECK-NEXT: Beginning address index: 3
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