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https://github.com/c64scene-ar/llvm-6502.git
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57 lines
1.6 KiB
LLVM
57 lines
1.6 KiB
LLVM
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; RUN: opt < %s -indvars -liv-reduce -S | FileCheck %s
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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"
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target triple = "x86_64-apple-macosx"
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; CHECK-LABEL: @addwithoverflow
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; CHECK-LABEL: loop1:
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; CHECK-NOT: zext
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; CHECK: add nsw
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; CHECK: @llvm.sadd.with.overflow
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; CHECK-LABEL: loop2:
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; CHECK-NOT: extractvalue
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; CHECK: add nuw nsw
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; CHECK: @llvm.sadd.with.overflow
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; CHECK-LABEL: loop3:
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; CHECK-NOT: extractvalue
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; CHECK: ret
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define i64 @addwithoverflow(i32 %n, i64* %a) {
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entry:
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br label %loop0
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loop0:
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%i = phi i32 [ 0, %entry ], [ %i1val, %loop3 ]
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%s = phi i32 [ 0, %entry ], [ %addsval, %loop3 ]
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%bc = icmp ult i32 %i, %n
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br i1 %bc, label %loop1, label %exit
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loop1:
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%zxt = zext i32 %i to i64
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%ofs = shl nuw nsw i64 %zxt, 3
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%gep = getelementptr i64* %a, i64 %zxt
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%v = load i64* %gep, align 8
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%truncv = trunc i64 %v to i32
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%adds = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %s, i32 %truncv)
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%ovflows = extractvalue { i32, i1 } %adds, 1
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br i1 %ovflows, label %exit, label %loop2
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loop2:
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%addsval = extractvalue { i32, i1 } %adds, 0
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%i1 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %i, i32 1)
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%i1check = extractvalue { i32, i1 } %i1, 1
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br i1 %i1check, label %exit, label %loop3
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loop3:
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%i1val = extractvalue { i32, i1 } %i1, 0
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%test = icmp slt i32 %i1val, %n
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br i1 %test, label %return, label %loop0
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return:
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%ret = zext i32 %addsval to i64
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ret i64 %ret
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exit:
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unreachable
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}
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declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)
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