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- ; RUN: opt < %s -indvars -liv-reduce -S | FileCheck %s
- target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
- target triple = "x86_64-apple-macosx"
- ; CHECK-LABEL: @addwithoverflow
- ; CHECK-LABEL: loop1:
- ; CHECK-NOT: zext
- ; CHECK: add nsw
- ; CHECK: @llvm.sadd.with.overflow
- ; CHECK-LABEL: loop2:
- ; CHECK-NOT: extractvalue
- ; CHECK: add nuw
- ; CHECK: @llvm.sadd.with.overflow
- ; CHECK-LABEL: loop3:
- ; CHECK-NOT: extractvalue
- ; CHECK: ret
- define i64 @addwithoverflow(i32 %n, i64* %a) {
- entry:
- br label %loop0
- loop0:
- %i = phi i32 [ 0, %entry ], [ %i1val, %loop3 ]
- %s = phi i32 [ 0, %entry ], [ %addsval, %loop3 ]
- %bc = icmp ult i32 %i, %n
- br i1 %bc, label %loop1, label %exit
- loop1:
- %zxt = zext i32 %i to i64
- %ofs = shl nuw nsw i64 %zxt, 3
- %gep = getelementptr i64, i64* %a, i64 %zxt
- %v = load i64, i64* %gep, align 8
- %truncv = trunc i64 %v to i32
- %adds = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %s, i32 %truncv)
- %ovflows = extractvalue { i32, i1 } %adds, 1
- br i1 %ovflows, label %exit, label %loop2
- loop2:
- %addsval = extractvalue { i32, i1 } %adds, 0
- %i1 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %i, i32 1)
- %i1check = extractvalue { i32, i1 } %i1, 1
- br i1 %i1check, label %exit, label %loop3
- loop3:
- %i1val = extractvalue { i32, i1 } %i1, 0
- %test = icmp slt i32 %i1val, %n
- br i1 %test, label %return, label %loop0
- return:
- %ret = zext i32 %addsval to i64
- ret i64 %ret
- exit:
- unreachable
- }
- declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)
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