68 lines
2.7 KiB
LLVM
68 lines
2.7 KiB
LLVM
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; RUN: llc < %s -verify-machineinstrs -no-phi-elim-live-out-early-exit | FileCheck %s
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target triple = "x86_64-apple-macosx10.8.0"
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; The critical edge from for.cond to if.end2 should be split to avoid injecting
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; copies into the loop. The use of %b after the loop causes interference that
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; makes a copy necessary.
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; <rdar://problem/11561842>
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;
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; CHECK: split_loop_exit
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; CHECK: %for.cond
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; CHECK-NOT: mov
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; CHECK: je
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define i32 @split_loop_exit(i32 %a, i32 %b, i8* nocapture %p) nounwind uwtable readonly ssp {
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entry:
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%cmp = icmp sgt i32 %a, 10
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br i1 %cmp, label %for.cond, label %if.end2
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for.cond: ; preds = %entry, %for.cond
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%p.addr.0 = phi i8* [ %incdec.ptr, %for.cond ], [ %p, %entry ]
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%incdec.ptr = getelementptr inbounds i8, i8* %p.addr.0, i64 1
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%0 = load i8, i8* %p.addr.0, align 1
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%tobool = icmp eq i8 %0, 0
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br i1 %tobool, label %for.cond, label %if.end2
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if.end2: ; preds = %for.cond, %entry
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%r.0 = phi i32 [ %a, %entry ], [ %b, %for.cond ]
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%add = add nsw i32 %r.0, %b
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ret i32 %add
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}
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; CHECK: split_live_out
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; CHECK: %while.body
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; CHECK: cmp
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; CHECK-NEXT: ja
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define i8* @split_live_out(i32 %value, i8* %target) nounwind uwtable readonly ssp {
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entry:
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%cmp10 = icmp ugt i32 %value, 127
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br i1 %cmp10, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body.preheader, %while.body
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%target.addr.012 = phi i8* [ %incdec.ptr, %while.body ], [ %target, %while.body.preheader ]
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%value.addr.011 = phi i32 [ %shr, %while.body ], [ %value, %while.body.preheader ]
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%or = or i32 %value.addr.011, 128
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%conv = trunc i32 %or to i8
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store i8 %conv, i8* %target.addr.012, align 1
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%shr = lshr i32 %value.addr.011, 7
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%incdec.ptr = getelementptr inbounds i8, i8* %target.addr.012, i64 1
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%cmp = icmp ugt i32 %value.addr.011, 16383
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit: ; preds = %while.body
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%incdec.ptr.lcssa = phi i8* [ %incdec.ptr, %while.body ]
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%shr.lcssa = phi i32 [ %shr, %while.body ]
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br label %while.end
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while.end: ; preds = %while.end.loopexit, %entry
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%target.addr.0.lcssa = phi i8* [ %target, %entry ], [ %incdec.ptr.lcssa, %while.end.loopexit ]
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%value.addr.0.lcssa = phi i32 [ %value, %entry ], [ %shr.lcssa, %while.end.loopexit ]
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%conv1 = trunc i32 %value.addr.0.lcssa to i8
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store i8 %conv1, i8* %target.addr.0.lcssa, align 1
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%incdec.ptr3 = getelementptr inbounds i8, i8* %target.addr.0.lcssa, i64 1
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ret i8* %incdec.ptr3
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}
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