return false;
}
+// Return true if Op is either an unextended load, or a load with the
+// extension type given by IsUnsigned.
+static bool isNaturalMemoryOperand(SDValue Op, bool IsUnsigned) {
+ LoadSDNode *Load = dyn_cast<LoadSDNode>(Op.getNode());
+ if (Load)
+ switch (Load->getExtensionType()) {
+ case ISD::NON_EXTLOAD:
+ case ISD::EXTLOAD:
+ return true;
+ case ISD::SEXTLOAD:
+ return !IsUnsigned;
+ case ISD::ZEXTLOAD:
+ return IsUnsigned;
+ default:
+ break;
+ }
+ return false;
+}
+
+// Return true if it is better to swap comparison operands Op0 and Op1.
+// IsUnsigned says whether an integer comparison is signed or unsigned.
+static bool shouldSwapCmpOperands(SDValue Op0, SDValue Op1,
+ bool IsUnsigned) {
+ // Leave f128 comparisons alone, since they have no memory forms.
+ if (Op0.getValueType() == MVT::f128)
+ return false;
+
+ // Always keep a floating-point constant second, since comparisons with
+ // zero can use LOAD TEST and comparisons with other constants make a
+ // natural memory operand.
+ if (isa<ConstantFPSDNode>(Op1))
+ return false;
+
+ // Never swap comparisons with zero since there are many ways to optimize
+ // those later.
+ ConstantSDNode *COp1 = dyn_cast<ConstantSDNode>(Op1);
+ if (COp1 && COp1->getZExtValue() == 0)
+ return false;
+
+ // Look for cases where Cmp0 is a single-use load and Cmp1 isn't.
+ // In that case we generally prefer the memory to be second.
+ if ((isNaturalMemoryOperand(Op0, IsUnsigned) && Op0.hasOneUse()) &&
+ !(isNaturalMemoryOperand(Op1, IsUnsigned) && Op1.hasOneUse())) {
+ // The only exceptions are when the second operand is a constant and
+ // we can use things like CHHSI.
+ if (!COp1)
+ return true;
+ if (IsUnsigned) {
+ // The memory-immediate instructions require 16-bit unsigned integers.
+ if (isUInt<16>(COp1->getZExtValue()))
+ return false;
+ } else {
+ // There are no comparisons between integers and signed memory bytes.
+ // The others require 16-bit signed integers.
+ if (cast<LoadSDNode>(Op0.getNode())->getMemoryVT() == MVT::i8 ||
+ isInt<16>(COp1->getSExtValue()))
+ return false;
+ }
+ return true;
+ }
+ return false;
+}
+
// Return a target node that compares CmpOp0 with CmpOp1 and stores a
// 2-bit result in CC. Set CCValid to the CCMASK_* of all possible
// 2-bit results and CCMask to the subset of those results that are
IsUnsigned = true;
}
+ if (shouldSwapCmpOperands(CmpOp0, CmpOp1, IsUnsigned)) {
+ std::swap(CmpOp0, CmpOp1);
+ CCMask = ((CCMask & SystemZ::CCMASK_CMP_EQ) |
+ (CCMask & SystemZ::CCMASK_CMP_GT ? SystemZ::CCMASK_CMP_LT : 0) |
+ (CCMask & SystemZ::CCMASK_CMP_LT ? SystemZ::CCMASK_CMP_GT : 0) |
+ (CCMask & SystemZ::CCMASK_CMP_UO));
+ }
+
SDLoc DL(CmpOp0);
return DAG.getNode((IsUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
DL, MVT::Glue, CmpOp0, CmpOp1);
%res = select i1 %cond, i64 %a, i64 %b
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CEB to be used,
+; first with oeq.
+define i64 @f9(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f9:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: je {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp oeq float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then one.
+define i64 @f10(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f10:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jlh {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp one float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then olt.
+define i64 @f11(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f11:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp olt float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ole.
+define i64 @f12(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f12:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jhe {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ole float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then oge.
+define i64 @f13(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f13:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jle {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp oge float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ogt.
+define i64 @f14(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f14:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jl {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ogt float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ueq.
+define i64 @f15(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f15:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jnlh {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ueq float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then une.
+define i64 @f16(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f16:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jne {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp une float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ult.
+define i64 @f17(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f17:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jnle {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ult float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ule.
+define i64 @f18(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f18:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jnl {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ule float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then uge.
+define i64 @f19(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f19:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jnh {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp uge float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
+
+; ...then ugt.
+define i64 @f20(i64 %a, i64 %b, float %f2, float *%ptr) {
+; CHECK-LABEL: f20:
+; CHECK: ceb %f0, 0(%r4)
+; CHECK-NEXT: jnhe {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load float *%ptr
+ %cond = fcmp ugt float %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
%res = select i1 %cond, i64 %a, i64 %b
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CDB to be used,
+define i64 @f9(i64 %a, i64 %b, double %f2, double *%ptr) {
+; CHECK-LABEL: f9:
+; CHECK: cdb %f0, 0(%r4)
+; CHECK-NEXT: jl {{\.L.*}}
+; CHECK: lgr %r2, %r3
+; CHECK: br %r14
+ %f1 = load double *%ptr
+ %cond = fcmp ogt double %f1, %f2
+ %res = select i1 %cond, i64 %a, i64 %b
+ ret i64 %res
+}
store i32 %res, i32 *%dst
ret void
}
+
+; Check the comparison can be reversed if that allows CH to be used.
+define double @f11(double %a, double %b, i32 %rhs, i16 *%src) {
+; CHECK-LABEL: f11:
+; CHECK: ch %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %half = load i16 *%src
+ %lhs = sext i16 %half to i32
+ %cond = icmp slt i32 %lhs, %rhs
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
while.end:
ret void
}
+
+; Check the comparison can be reversed if that allows C to be used.
+define double @f13(double %a, double %b, i32 %i2, i32 *%ptr) {
+; CHECK-LABEL: f13:
+; CHECK: c %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i32 *%ptr
+ %cond = icmp slt i32 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
%res = select i1 %cond, double %a, double %b
ret double %res
}
+
+; Check the comparison can be reversed if that allows CL to be used.
+define double @f12(double %a, double %b, i32 %i2, i32 *%ptr) {
+; CHECK-LABEL: f12:
+; CHECK: cl %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i32 *%ptr
+ %cond = icmp ult i32 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
store i64 %res, i64 *%dst
ret void
}
+
+; Check the comparison can be reversed if that allows CGH to be used.
+define double @f8(double %a, double %b, i64 %rhs, i16 *%src) {
+; CHECK-LABEL: f8:
+; CHECK: cgh %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %half = load i16 *%src
+ %lhs = sext i16 %half to i64
+ %cond = icmp slt i64 %lhs, %rhs
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
ret double %res
}
-; Check signed comparisonn with memory.
+; Check signed comparison with memory.
define double @f5(double %a, double %b, i64 %i1, i32 *%ptr) {
; CHECK-LABEL: f5:
; CHECK: cgf %r2, 0(%r3)
ret i64 %sel9
}
+
+; Check the comparison can be reversed if that allows CGF to be used.
+define double @f16(double %a, double %b, i64 %i2, i32 *%ptr) {
+; CHECK-LABEL: f16:
+; CHECK: cgf %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %unext = load i32 *%ptr
+ %i1 = sext i32 %unext to i64
+ %cond = icmp slt i64 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
ret double %res
}
-; Check unsigned comparisonn with memory.
+; Check unsigned comparison with memory.
define double @f9(double %a, double %b, i64 %i1, i32 *%ptr) {
; CHECK-LABEL: f9:
; CHECK: clgf %r2, 0(%r3)
ret i64 %sel9
}
+
+; Check the comparison can be reversed if that allows CLGF to be used.
+define double @f20(double %a, double %b, i64 %i2, i32 *%ptr) {
+; CHECK-LABEL: f20:
+; CHECK: clgf %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %unext = load i32 *%ptr
+ %i1 = zext i32 %unext to i64
+ %cond = icmp ult i64 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
%res = select i1 %cond, double %a, double %b
ret double %res
}
+
+; Check the comparison can be reversed if that allows CG to be used.
+define double @f9(double %a, double %b, i64 %i2, i64 *%ptr) {
+; CHECK-LABEL: f9:
+; CHECK: cg %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i64 *%ptr
+ %cond = icmp slt i64 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
%res = select i1 %cond, double %a, double %b
ret double %res
}
+
+; Check the comparison can be reversed if that allows CLG to be used.
+define double @f9(double %a, double %b, i64 %i2, i64 *%ptr) {
+; CHECK-LABEL: f9:
+; CHECK: clg %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i64 *%ptr
+ %cond = icmp ult i64 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}
%res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
ret i32 %res
}
+
+; Check the comparison can be reversed if that allows CHRL to be used.
+define i32 @f6(i32 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: chrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i16 *@g
+ %src1 = sext i16 %val to i32
+ %cond = icmp slt i32 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i32 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i32 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i32 %res
+}
%res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
ret i32 %res
}
+
+; Check the comparison can be reversed if that allows CLHRL to be used.
+define i32 @f6(i32 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: clhrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i16 *@g
+ %src1 = zext i16 %val to i32
+ %cond = icmp ult i32 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i32 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i32 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i32 %res
+}
%res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
ret i32 %res
}
+
+; Check the comparison can be reversed if that allows CRL to be used.
+define i32 @f7(i32 %src2) {
+; CHECK-LABEL: f7:
+; CHECK: crl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %src1 = load i32 *@g
+ %cond = icmp slt i32 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i32 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i32 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i32 %res
+}
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CGHRL to be used.
+define i64 @f6(i64 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: cghrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i16 *@g
+ %src1 = sext i16 %val to i64
+ %cond = icmp slt i64 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i64 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i64 %res
+}
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CLGHRL to be used.
+define i64 @f6(i64 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: clghrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i16 *@g
+ %src1 = zext i16 %val to i64
+ %cond = icmp ult i64 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i64 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i64 %res
+}
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CGFRL to be used.
+define i64 @f6(i64 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: cgfrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i32 *@g
+ %src1 = sext i32 %val to i64
+ %cond = icmp slt i64 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i64 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i64 %res
+}
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CLGFRL to be used.
+define i64 @f6(i64 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: clgfrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %val = load i32 *@g
+ %src1 = zext i32 %val to i64
+ %cond = icmp ult i64 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i64 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i64 %res
+}
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
+
+; Check the comparison can be reversed if that allows CGRL to be used.
+define i64 @f6(i64 %src2) {
+; CHECK-LABEL: f6:
+; CHECK: cgrl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %src1 = load i64 *@g
+ %cond = icmp slt i64 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i64 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i64 %res
+}
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