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cfe/trunk/test/Frontend/fixed_point_conversions.c

// 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
}