llvm-6502/test/CodeGen/Generic/add-with-overflow-24.ll
Duncan Sands ab0c578bfd For amusement, implement SADDO, SSUBO, UADDO, USUBO
for promoted integer types, eg: i16 on ppc-32, or
i24 on any platform.  Complete support for arbitrary
precision integers would require handling expanded
integer types, eg: i128, but I couldn't be bothered.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60834 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-10 12:30:42 +00:00

43 lines
1.4 KiB
LLVM

; RUN: llvm-as < %s | llc
@ok = internal constant [4 x i8] c"%d\0A\00"
@no = internal constant [4 x i8] c"no\0A\00"
define i1 @func1(i24 signext %v1, i24 signext %v2) nounwind {
entry:
%t = call {i24, i1} @llvm.sadd.with.overflow.i24(i24 %v1, i24 %v2)
%sum = extractvalue {i24, i1} %t, 0
%sum32 = sext i24 %sum to i32
%obit = extractvalue {i24, i1} %t, 1
br i1 %obit, label %overflow, label %normal
normal:
%t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum32 ) nounwind
ret i1 true
overflow:
%t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
ret i1 false
}
define i1 @func2(i24 zeroext %v1, i24 zeroext %v2) nounwind {
entry:
%t = call {i24, i1} @llvm.uadd.with.overflow.i24(i24 %v1, i24 %v2)
%sum = extractvalue {i24, i1} %t, 0
%sum32 = zext i24 %sum to i32
%obit = extractvalue {i24, i1} %t, 1
br i1 %obit, label %carry, label %normal
normal:
%t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum32 ) nounwind
ret i1 true
carry:
%t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
ret i1 false
}
declare i32 @printf(i8*, ...) nounwind
declare {i24, i1} @llvm.sadd.with.overflow.i24(i24, i24)
declare {i24, i1} @llvm.uadd.with.overflow.i24(i24, i24)