//
//===----------------------------------------------------------------------===//
-#include "CodeGenFunction.h"
-#include "CGCleanup.h"
#include "CGCXXABI.h"
+#include "CGCleanup.h"
#include "CGDebugInfo.h"
#include "CGObjCRuntime.h"
+#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Expr.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/StmtVisitor.h"
+#include "clang/Basic/FixedPoint.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/Optional.h"
SourceLocation Loc,
ScalarConversionOpts Opts = ScalarConversionOpts());
+ Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy,
+ SourceLocation Loc);
+
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
QualType DstType,
SourceLocation Loc,
ScalarConversionOpts Opts) {
+ assert(!SrcType->isFixedPointType() && !DstType->isFixedPointType() &&
+ "Use the ScalarExprEmitter::EmitFixedPoint family functions for "
+ "handling conversions involving fixed point types.");
+
QualType NoncanonicalSrcType = SrcType;
QualType NoncanonicalDstType = DstType;
return Res;
}
+Value *ScalarExprEmitter::EmitFixedPointConversion(Value *Src, QualType SrcTy,
+ QualType DstTy,
+ SourceLocation Loc) {
+ using llvm::APInt;
+ using llvm::ConstantInt;
+ using llvm::Value;
+
+ assert(SrcTy->isFixedPointType());
+ assert(DstTy->isFixedPointType());
+
+ FixedPointSemantics SrcFPSema =
+ CGF.getContext().getFixedPointSemantics(SrcTy);
+ FixedPointSemantics DstFPSema =
+ CGF.getContext().getFixedPointSemantics(DstTy);
+ unsigned SrcWidth = SrcFPSema.getWidth();
+ unsigned DstWidth = DstFPSema.getWidth();
+ unsigned SrcScale = SrcFPSema.getScale();
+ unsigned DstScale = DstFPSema.getScale();
+ bool IsSigned = SrcFPSema.isSigned();
+
+ Value *Result = Src;
+ unsigned ResultWidth = SrcWidth;
+
+ if (!DstFPSema.isSaturated()) {
+ // Downscale
+ if (DstScale < SrcScale) {
+ if (IsSigned)
+ Result = Builder.CreateAShr(Result, SrcScale - DstScale);
+ else
+ Result = Builder.CreateLShr(Result, SrcScale - DstScale);
+ }
+
+ // Resize
+ llvm::Type *DstIntTy = Builder.getIntNTy(DstWidth);
+ if (IsSigned)
+ Result = Builder.CreateSExtOrTrunc(Result, DstIntTy);
+ else
+ Result = Builder.CreateZExtOrTrunc(Result, DstIntTy);
+
+ // Upscale
+ if (DstScale > SrcScale)
+ Result = Builder.CreateShl(Result, DstScale - SrcScale);
+ } else {
+ if (DstScale > SrcScale) {
+ // Need to extend first before scaling up
+ ResultWidth = SrcWidth + DstScale - SrcScale;
+ llvm::Type *UpscaledTy = Builder.getIntNTy(ResultWidth);
+
+ if (IsSigned)
+ Result = Builder.CreateSExt(Result, UpscaledTy);
+ else
+ Result = Builder.CreateZExt(Result, UpscaledTy);
+
+ Result = Builder.CreateShl(Result, DstScale - SrcScale);
+ } else if (DstScale < SrcScale) {
+ if (IsSigned)
+ Result = Builder.CreateAShr(Result, SrcScale - DstScale);
+ else
+ Result = Builder.CreateLShr(Result, SrcScale - DstScale);
+ }
+
+ if (DstFPSema.getIntegralBits() < SrcFPSema.getIntegralBits()) {
+ auto Max = ConstantInt::get(
+ CGF.getLLVMContext(),
+ APFixedPoint::getMax(DstFPSema).getValue().extOrTrunc(ResultWidth));
+ Value *TooHigh = IsSigned ? Builder.CreateICmpSGT(Result, Max)
+ : Builder.CreateICmpUGT(Result, Max);
+ Result = Builder.CreateSelect(TooHigh, Max, Result);
+
+ if (IsSigned) {
+ // Cannot overflow min to dest type is src is unsigned since all fixed
+ // point types can cover the unsigned min of 0.
+ auto Min = ConstantInt::get(
+ CGF.getLLVMContext(),
+ APFixedPoint::getMin(DstFPSema).getValue().extOrTrunc(ResultWidth));
+ Value *TooLow = Builder.CreateICmpSLT(Result, Min);
+ Result = Builder.CreateSelect(TooLow, Min, Result);
+ }
+ } else if (IsSigned && !DstFPSema.isSigned()) {
+ llvm::Type *ResultTy = Builder.getIntNTy(ResultWidth);
+ Value *Zero = ConstantInt::getNullValue(ResultTy);
+ Value *LTZero = Builder.CreateICmpSLT(Result, Zero);
+ Result = Builder.CreateSelect(LTZero, Zero, Result);
+ }
+
+ // Final resizing to dst width
+ llvm::Type *DstIntTy = Builder.getIntNTy(DstWidth);
+ if (IsSigned)
+ Result = Builder.CreateSExtOrTrunc(Result, DstIntTy);
+ else
+ Result = Builder.CreateZExtOrTrunc(Result, DstIntTy);
+ }
+ return Result;
+}
+
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *ScalarExprEmitter::EmitComplexToScalarConversion(
return Builder.CreateVectorSplat(NumElements, Elt, "splat");
}
+ case CK_FixedPointCast:
+ return EmitFixedPointConversion(Visit(E), E->getType(), DestTy,
+ CE->getExprLoc());
+
case CK_IntegralCast: {
ScalarConversionOpts Opts;
if (CGF.SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)) {
case Type::STK_FloatingComplex:
case Type::STK_IntegralComplex:
case Type::STK_MemberPointer:
+ case Type::STK_FixedPoint:
llvm_unreachable("illegal cast from pointer");
}
llvm_unreachable("Should have returned before this");
+ case Type::STK_FixedPoint:
+ switch (DestTy->getScalarTypeKind()) {
+ case Type::STK_FixedPoint:
+ return CK_FixedPointCast;
+ case Type::STK_Bool:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << DestTy;
+ return CK_IntegralToBoolean;
+ case Type::STK_Integral:
+ case Type::STK_Floating:
+ case Type::STK_IntegralComplex:
+ case Type::STK_FloatingComplex:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << DestTy;
+ return CK_IntegralCast;
+ case Type::STK_CPointer:
+ case Type::STK_ObjCObjectPointer:
+ case Type::STK_BlockPointer:
+ case Type::STK_MemberPointer:
+ llvm_unreachable("illegal cast to pointer type");
+ }
+ llvm_unreachable("Should have returned before this");
+
case Type::STK_Bool: // casting from bool is like casting from an integer
case Type::STK_Integral:
switch (DestTy->getScalarTypeKind()) {
return CK_FloatingRealToComplex;
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
+ case Type::STK_FixedPoint:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << SrcTy;
+ return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
llvm_unreachable("valid float->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
+ case Type::STK_FixedPoint:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << SrcTy;
+ return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
llvm_unreachable("valid complex float->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
+ case Type::STK_FixedPoint:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << SrcTy;
+ return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
llvm_unreachable("valid complex int->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
+ case Type::STK_FixedPoint:
+ Diag(Src.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << SrcTy;
+ return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
}
if (Context.getLangOpts().CPlusPlus) {
// C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
// operand contextually converted to bool.
+ if (resultType->getScalarTypeKind() == Type::STK_FixedPoint) {
+ return ExprError(
+ Diag(Input.get()->getExprLoc(),
+ diag::err_unimplemented_conversion_with_fixed_point_type)
+ << resultType);
+ }
Input = ImpCastExprToType(Input.get(), Context.BoolTy,
ScalarTypeToBooleanCastKind(resultType));
} else if (Context.getLangOpts().OpenCL &&
--- /dev/null
+// RUN: %clang_cc1 -ffixed-point -S -emit-llvm %s -o - | FileCheck %s -check-prefix=DEFAULT
+// RUN: %clang_cc1 -ffixed-point -S -emit-llvm %s -o - -fpadding-on-unsigned-fixed-point | FileCheck %s -check-prefix=SAME
+
+void TestFixedPointCastSameType() {
+ _Accum a = 2.5k;
+ _Accum a2 = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a2, align 4
+
+ a2 = (_Accum)a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a2, align 4
+}
+
+void TestFixedPointCastDown() {
+ long _Accum la = 2.5lk;
+ _Accum a = la;
+ // DEFAULT: [[LACCUM:%[0-9]+]] = load i64, i64* %la, align 8
+ // DEFAULT-NEXT: [[ACCUM_AS_I64:%[0-9]+]] = ashr i64 [[LACCUM]], 16
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = trunc i64 [[ACCUM_AS_I64]] to i32
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ a = (_Accum)la;
+ // DEFAULT: [[LACCUM:%[0-9]+]] = load i64, i64* %la, align 8
+ // DEFAULT-NEXT: [[ACCUM_AS_I64:%[0-9]+]] = ashr i64 [[LACCUM]], 16
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = trunc i64 [[ACCUM_AS_I64]] to i32
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ short _Accum sa = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[SACCUM_AS_I32:%[0-9]+]] = ashr i32 [[ACCUM]], 8
+ // DEFAULT-NEXT: [[SACCUM:%[0-9]+]] = trunc i32 [[SACCUM_AS_I32]] to i16
+ // DEFAULT-NEXT: store i16 [[SACCUM]], i16* %sa, align 2
+
+ sa = (short _Accum)a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[SACCUM_AS_I32:%[0-9]+]] = ashr i32 [[ACCUM]], 8
+ // DEFAULT-NEXT: [[SACCUM:%[0-9]+]] = trunc i32 [[SACCUM_AS_I32]] to i16
+ // DEFAULT-NEXT: store i16 [[SACCUM]], i16* %sa, align 2
+}
+
+void TestFixedPointCastUp() {
+ short _Accum sa = 2.5hk;
+ _Accum a = sa;
+ // DEFAULT: [[SACCUM:%[0-9]+]] = load i16, i16* %sa, align 2
+ // DEFAULT-NEXT: [[SACCUM_BUFF:%[0-9]+]] = sext i16 [[SACCUM]] to i32
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = shl i32 [[SACCUM_BUFF]], 8
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ long _Accum la = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[ACCUM_BUFF:%[0-9]+]] = sext i32 [[ACCUM]] to i64
+ // DEFAULT-NEXT: [[LACCUM:%[0-9]+]] = shl i64 [[ACCUM_BUFF]], 16
+ // DEFAULT-NEXT: store i64 [[LACCUM]], i64* %la, align 8
+
+ a = (_Accum)sa;
+ // DEFAULT: [[SACCUM:%[0-9]+]] = load i16, i16* %sa, align 2
+ // DEFAULT-NEXT: [[SACCUM_BUFF:%[0-9]+]] = sext i16 [[SACCUM]] to i32
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = shl i32 [[SACCUM_BUFF]], 8
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ la = (long _Accum)a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[ACCUM_BUFF:%[0-9]+]] = sext i32 [[ACCUM]] to i64
+ // DEFAULT-NEXT: [[LACCUM:%[0-9]+]] = shl i64 [[ACCUM_BUFF]], 16
+ // DEFAULT-NEXT: store i64 [[LACCUM]], i64* %la, align 8
+}
+
+void TestFixedPointCastSignedness() {
+ _Accum a = 2.5k;
+ unsigned _Accum ua = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[UACCUM:%[0-9]+]] = shl i32 [[ACCUM]], 1
+ // DEFAULT-NEXT: store i32 [[UACCUM]], i32* %ua, align 4
+ // SAME: TestFixedPointCastSignedness
+ // SAME: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // SAME-NEXT: store i32 [[ACCUM]], i32* %ua, align 4
+
+ a = ua;
+ // DEFAULT: [[UACCUM:%[0-9]+]] = load i32, i32* %ua, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = lshr i32 [[UACCUM]], 1
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+ // SAME: [[ACCUM:%[0-9]+]] = load i32, i32* %ua, align 4
+ // SAME-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ ua = (unsigned _Accum)a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[UACCUM:%[0-9]+]] = shl i32 [[ACCUM]], 1
+ // DEFAULT-NEXT: store i32 [[UACCUM]], i32* %ua, align 4
+
+ a = (_Accum)ua;
+ // DEFAULT: [[UACCUM:%[0-9]+]] = load i32, i32* %ua, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = lshr i32 [[UACCUM]], 1
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ _Accum a2;
+ unsigned long _Accum ula = a2;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a2, align 4
+ // DEFAULT-NEXT: [[ACCUM_EXT:%[0-9]+]] = sext i32 [[ACCUM]] to i64
+ // DEFAULT-NEXT: [[LACCUM:%[0-9]+]] = shl i64 [[ACCUM_EXT]], 17
+ // DEFAULT-NEXT: store i64 [[LACCUM]], i64* %ula, align 8
+ // SAME: [[ACCUM:%[0-9]+]] = load i32, i32* %a2, align 4
+ // SAME-NEXT: [[ACCUM_EXT:%[0-9]+]] = sext i32 [[ACCUM]] to i64
+ // SAME-NEXT: [[LACCUM:%[0-9]+]] = shl i64 [[ACCUM_EXT]], 16
+ // SAME-NEXT: store i64 [[LACCUM]], i64* %ula, align 8
+}
+
+void TestFixedPointCastSaturation() {
+ _Accum a;
+ _Sat short _Accum sat_sa;
+ _Sat _Accum sat_a;
+ _Sat long _Accum sat_la;
+ _Sat unsigned short _Accum sat_usa;
+ _Sat unsigned _Accum sat_ua;
+ _Sat unsigned long _Accum sat_ula;
+ _Sat short _Fract sat_sf;
+ _Sat _Fract sat_f;
+ _Sat long _Fract sat_lf;
+
+ // Casting down between types
+ sat_sa = sat_a;
+ // DEFAULT: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = ashr i32 [[OLD_ACCUM]], 8
+ // DEFAULT-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i32 [[ACCUM]], 32767
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i32 32767, i32 [[ACCUM]]
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[RESULT]], -32768
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i32 -32768, i32 [[RESULT]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i32 [[RESULT2]] to i16
+ // DEFAULT-NEXT: store i16 [[RESULT_TRUNC]], i16* %sat_sa, align 2
+
+ // Accum to Fract, decreasing scale
+ sat_sf = sat_a;
+ // DEFAULT: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // DEFAULT-NEXT: [[FRACT:%[0-9]+]] = ashr i32 [[OLD_ACCUM]], 8
+ // DEFAULT-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i32 [[FRACT]], 127
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i32 127, i32 [[FRACT]]
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[RESULT]], -128
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i32 -128, i32 [[RESULT]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i32 [[RESULT2]] to i8
+ // DEFAULT-NEXT: store i8 [[RESULT_TRUNC]], i8* %sat_sf, align 1
+
+ // Accum to Fract, same scale
+ sat_f = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i32 [[ACCUM]], 32767
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i32 32767, i32 [[ACCUM]]
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[RESULT]], -32768
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i32 -32768, i32 [[RESULT]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i32 [[RESULT2]] to i16
+ // DEFAULT-NEXT: store i16 [[RESULT_TRUNC]], i16* %sat_f, align 2
+
+ // Accum to Fract, increasing scale
+ sat_lf = sat_a;
+ // DEFAULT: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = sext i32 [[OLD_ACCUM]] to i48
+ // DEFAULT-NEXT: [[FRACT:%[0-9]+]] = shl i48 [[ACCUM]], 16
+ // DEFAULT-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i48 [[FRACT]], 2147483647
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i48 2147483647, i48 [[FRACT]]
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i48 [[RESULT]], -2147483648
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i48 -2147483648, i48 [[RESULT]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i48 [[RESULT2]] to i32
+ // DEFAULT-NEXT: store i32 [[RESULT_TRUNC]], i32* %sat_lf, align 4
+
+ // Signed to unsigned, decreasing scale
+ _Sat _Accum sat_a2;
+ sat_usa = sat_a2;
+ // DEFAULT: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a2, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = ashr i32 [[OLD_ACCUM]], 7
+ // DEFAULT-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i32 [[ACCUM]], 65535
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i32 65535, i32 [[ACCUM]]
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[RESULT]], 0
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i32 0, i32 [[RESULT]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i32 [[RESULT2]] to i16
+ // DEFAULT-NEXT: store i16 [[RESULT_TRUNC]], i16* %sat_usa, align 2
+ // SAME: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a2, align 4
+ // SAME-NEXT: [[ACCUM:%[0-9]+]] = ashr i32 [[OLD_ACCUM]], 8
+ // SAME-NEXT: [[USE_MAX:%[0-9]+]] = icmp sgt i32 [[ACCUM]], 32767
+ // SAME-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MAX]], i32 32767, i32 [[ACCUM]]
+ // SAME-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[RESULT]], 0
+ // SAME-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i32 0, i32 [[RESULT]]
+ // SAME-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i32 [[RESULT2]] to i16
+ // SAME-NEXT: store i16 [[RESULT_TRUNC]], i16* %sat_usa, align 2
+
+ // Signed to unsigned, increasing scale
+ sat_ua = sat_a;
+ // DEFAULT: [[OLD_ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // DEFAULT-NEXT: [[ACCUM_EXT:%[0-9]+]] = sext i32 [[OLD_ACCUM]] to i33
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = shl i33 [[ACCUM_EXT]], 1
+ // DEFAULT-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i33 [[ACCUM]], 0
+ // DEFAULT-NEXT: [[RESULT2:%[0-9]+]] = select i1 [[USE_MIN]], i33 0, i33 [[ACCUM]]
+ // DEFAULT-NEXT: [[RESULT_TRUNC:%[0-9]+]] = trunc i33 [[RESULT2]] to i32
+ // DEFAULT-NEXT: store i32 [[RESULT_TRUNC]], i32* %sat_ua, align 4
+ // SAME: [[ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // SAME-NEXT: [[USE_MIN:%[0-9]+]] = icmp slt i32 [[ACCUM]], 0
+ // SAME-NEXT: [[RESULT:%[0-9]+]] = select i1 [[USE_MIN]], i32 0, i32 [[ACCUM]]
+ // SAME-NEXT: store i32 [[RESULT]], i32* %sat_ua, align 4
+
+ // Nothing when saturating to the same type and size
+ sat_a = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %sat_a, align 4
+
+ // Nothing when assigning back
+ a = sat_a;
+ // DEFAULT: [[SAT_ACCUM:%[0-9]+]] = load i32, i32* %sat_a, align 4
+ // DEFAULT-NEXT: store i32 [[SAT_ACCUM]], i32* %a, align 4
+
+ // No overflow when casting from fract to signed accum
+ sat_a = sat_f;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i16, i16* %sat_f, align 2
+ // DEFAULT-NEXT: [[FRACT_EXT:%[0-9]+]] = sext i16 [[FRACT]] to i32
+ // DEFAULT-NEXT: store i32 [[FRACT_EXT]], i32* %sat_a, align 4
+
+ // Only get overflow checking if signed fract to unsigned accum
+ sat_ua = sat_sf;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i8, i8* %sat_sf, align 1
+ // DEFAULT-NEXT: [[FRACT_EXT:%[0-9]+]] = sext i8 [[FRACT]] to i17
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = shl i17 [[FRACT_EXT]], 9
+ // DEFAULT-NEXT: [[IS_NEG:%[0-9]+]] = icmp slt i17 [[ACCUM]], 0
+ // DEFAULT-NEXT: [[RESULT:%[0-9]+]] = select i1 [[IS_NEG]], i17 0, i17 [[ACCUM]]
+ // DEFAULT-NEXT: [[RESULT_EXT:%[0-9]+]] = sext i17 [[RESULT]] to i32
+ // DEFAULT-NEXT: store i32 [[RESULT_EXT]], i32* %sat_ua, align 4
+ // SAME: [[FRACT:%[0-9]+]] = load i8, i8* %sat_sf, align 1
+ // SAME-NEXT: [[FRACT_EXT:%[0-9]+]] = sext i8 [[FRACT]] to i16
+ // SAME-NEXT: [[ACCUM:%[0-9]+]] = shl i16 [[FRACT_EXT]], 8
+ // SAME-NEXT: [[IS_NEG:%[0-9]+]] = icmp slt i16 [[ACCUM]], 0
+ // SAME-NEXT: [[RESULT:%[0-9]+]] = select i1 [[IS_NEG]], i16 0, i16 [[ACCUM]]
+ // SAME-NEXT: [[RESULT_EXT:%[0-9]+]] = sext i16 [[RESULT]] to i32
+ // SAME-NEXT: store i32 [[RESULT_EXT]], i32* %sat_ua, align 4
+}
+
+void TestFixedPointCastBetFractAccum() {
+ short _Accum sa;
+ _Accum a;
+ long _Accum la;
+ short _Fract sf;
+ _Fract f;
+ long _Fract lf;
+ unsigned _Accum ua;
+ unsigned _Fract uf;
+
+ // To lower scale
+ sf = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[FRACT:%[0-9]+]] = ashr i32 [[ACCUM]], 8
+ // DEFAULT-NEXT: [[FRACT_TRUNC:%[0-9]+]] = trunc i32 [[FRACT]] to i8
+ // DEFAULT-NEXT: store i8 [[FRACT_TRUNC]], i8* %sf, align 1
+
+ // To higher scale
+ a = sf;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i8, i8* %sf, align 1
+ // DEFAULT-NEXT: [[FRACT_EXT:%[0-9]+]] = sext i8 [[FRACT]] to i32
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = shl i32 [[FRACT_EXT]], 8
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ // To same scale
+ f = a;
+ // DEFAULT: [[ACCUM:%[0-9]+]] = load i32, i32* %a, align 4
+ // DEFAULT-NEXT: [[FRACT:%[0-9]+]] = trunc i32 [[ACCUM]] to i16
+ // DEFAULT-NEXT: store i16 [[FRACT]], i16* %f, align 2
+
+ a = f;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i16, i16* %f, align 2
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = sext i16 [[FRACT]] to i32
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %a, align 4
+
+ // To unsigned
+ ua = uf;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i16, i16* %uf, align 2
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = zext i16 [[FRACT]] to i32
+ // DEFAULT-NEXT: store i32 [[ACCUM]], i32* %ua, align 4
+ // SAME: [[FRACT:%[0-9]+]] = load i16, i16* %uf, align 2
+ // SAME-NEXT: [[ACCUM:%[0-9]+]] = zext i16 [[FRACT]] to i32
+ // SAME-NEXT: store i32 [[ACCUM]], i32* %ua, align 4
+
+ uf = ua;
+ // DEFAULT: [[FRACT:%[0-9]+]] = load i32, i32* %ua, align 4
+ // DEFAULT-NEXT: [[ACCUM:%[0-9]+]] = trunc i32 [[FRACT]] to i16
+ // DEFAULT-NEXT: store i16 [[ACCUM]], i16* %uf, align 2
+ // SAME: [[FRACT:%[0-9]+]] = load i32, i32* %ua, align 4
+ // SAME-NEXT: [[ACCUM:%[0-9]+]] = trunc i32 [[FRACT]] to i16
+ // SAME-NEXT: store i16 [[ACCUM]], i16* %uf, align 2
+}