1 files changed, 83 insertions, 0 deletions
diff --git a/generic/lib/integer/sub_sat_impl.ll b/generic/lib/integer/sub_sat_impl.ll
new file mode 100644
index 0000000..99abbc3
--- /dev/null
+++ b/generic/lib/integer/sub_sat_impl.ll
@@ -0,0 +1,83 @@
+declare {i8, i1} @llvm.ssub.with.overflow.i8(i8, i8)
+declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)
+
+define linkonce_odr i8 @__clc_sub_sat_impl_s8(i8 %x, i8 %y) nounwind readnone alwaysinline {
+  %call = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 %x, i8 %y)
+  %res = extractvalue {i8, i1} %call, 0
+  %over = extractvalue {i8, i1} %call, 1
+  %x.msb = ashr i8 %x, 7
+  %x.limit = xor i8 %x.msb, 127
+  %sat = select i1 %over, i8 %x.limit, i8 %res
+  ret i8 %sat
+}
+
+define linkonce_odr i8 @__clc_sub_sat_impl_u8(i8 %x, i8 %y) nounwind readnone alwaysinline {
+  %call = call {i8, i1} @llvm.usub.with.overflow.i8(i8 %x, i8 %y)
+  %res = extractvalue {i8, i1} %call, 0
+  %over = extractvalue {i8, i1} %call, 1
+  %sat = select i1 %over, i8 0, i8 %res
+  ret i8 %sat
+}
+
+declare {i16, i1} @llvm.ssub.with.overflow.i16(i16, i16)
+declare {i16, i1} @llvm.usub.with.overflow.i16(i16, i16)
+
+define linkonce_odr i16 @__clc_sub_sat_impl_s16(i16 %x, i16 %y) nounwind readnone alwaysinline {
+  %call = call {i16, i1} @llvm.ssub.with.overflow.i16(i16 %x, i16 %y)
+  %res = extractvalue {i16, i1} %call, 0
+  %over = extractvalue {i16, i1} %call, 1
+  %x.msb = ashr i16 %x, 15
+  %x.limit = xor i16 %x.msb, 32767
+  %sat = select i1 %over, i16 %x.limit, i16 %res
+  ret i16 %sat
+}
+
+define linkonce_odr i16 @__clc_sub_sat_impl_u16(i16 %x, i16 %y) nounwind readnone alwaysinline {
+  %call = call {i16, i1} @llvm.usub.with.overflow.i16(i16 %x, i16 %y)
+  %res = extractvalue {i16, i1} %call, 0
+  %over = extractvalue {i16, i1} %call, 1
+  %sat = select i1 %over, i16 0, i16 %res
+  ret i16 %sat
+}
+
+declare {i32, i1} @llvm.ssub.with.overflow.i32(i32, i32)
+declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32)
+
+define linkonce_odr i32 @__clc_sub_sat_impl_s32(i32 %x, i32 %y) nounwind readnone alwaysinline {
+  %call = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %x, i32 %y)
+  %res = extractvalue {i32, i1} %call, 0
+  %over = extractvalue {i32, i1} %call, 1
+  %x.msb = ashr i32 %x, 31
+  %x.limit = xor i32 %x.msb, 2147483647
+  %sat = select i1 %over, i32 %x.limit, i32 %res
+  ret i32 %sat
+}
+
+define linkonce_odr i32 @__clc_sub_sat_impl_u32(i32 %x, i32 %y) nounwind readnone alwaysinline {
+  %call = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %x, i32 %y)
+  %res = extractvalue {i32, i1} %call, 0
+  %over = extractvalue {i32, i1} %call, 1
+  %sat = select i1 %over, i32 0, i32 %res
+  ret i32 %sat
+}
+
+declare {i64, i1} @llvm.ssub.with.overflow.i64(i64, i64)
+declare {i64, i1} @llvm.usub.with.overflow.i64(i64, i64)
+
+define linkonce_odr i64 @__clc_sub_sat_impl_s64(i64 %x, i64 %y) nounwind readnone alwaysinline {
+  %call = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %x, i64 %y)
+  %res = extractvalue {i64, i1} %call, 0
+  %over = extractvalue {i64, i1} %call, 1
+  %x.msb = ashr i64 %x, 63
+  %x.limit = xor i64 %x.msb, 9223372036854775807
+  %sat = select i1 %over, i64 %x.limit, i64 %res
+  ret i64 %sat
+}
+
+define linkonce_odr i64 @__clc_sub_sat_impl_u64(i64 %x, i64 %y) nounwind readnone alwaysinline {
+  %call = call {i64, i1} @llvm.usub.with.overflow.i64(i64 %x, i64 %y)
+  %res = extractvalue {i64, i1} %call, 0
+  %over = extractvalue {i64, i1} %call, 1
+  %sat = select i1 %over, i64 0, i64 %res
+  ret i64 %sat
+}