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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54904 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2008-08-17 19:25:28 +00:00
parent 0ac3fc2a61
commit 4e49c80289
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test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll
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; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep "phi double" | count 1
define void @foobar(i32 %n) nounwind {
entry:
icmp eq i32 %n, 0 ; <i1>:0 [#uses=2]
br i1 %0, label %return, label %bb.nph
bb.nph: ; preds = %entry
%umax = select i1 %0, i32 1, i32 %n ; <i32> [#uses=1]
br label %bb
bb: ; preds = %bb, %bb.nph
%i.03 = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i32> [#uses=3]
tail call void @bar( i32 %i.03 ) nounwind
uitofp i32 %i.03 to double ; <double>:1 [#uses=1]
tail call void @foo( double %1 ) nounwind
%indvar.next = add i32 %i.03, 1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %indvar.next, %umax ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
; Unable to eliminate cast because the mantissa bits for double are not enough
; to hold all of i64 IV bits.
define void @foobar2(i64 %n) nounwind {
entry:
icmp eq i64 %n, 0 ; <i1>:0 [#uses=2]
br i1 %0, label %return, label %bb.nph
bb.nph: ; preds = %entry
%umax = select i1 %0, i64 1, i64 %n ; <i64> [#uses=1]
br label %bb
bb: ; preds = %bb, %bb.nph
%i.03 = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i64> [#uses=3]
trunc i64 %i.03 to i32 ; <i32>:1 [#uses=1]
tail call void @bar( i32 %1 ) nounwind
uitofp i64 %i.03 to double ; <double>:2 [#uses=1]
tail call void @foo( double %2 ) nounwind
%indvar.next = add i64 %i.03, 1 ; <i64> [#uses=2]
%exitcond = icmp eq i64 %indvar.next, %umax ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
; Unable to eliminate cast due to potentional overflow.
define void @foobar3() nounwind {
entry:
tail call i32 (...)* @nn( ) nounwind ; <i32>:0 [#uses=1]
icmp eq i32 %0, 0 ; <i1>:1 [#uses=1]
br i1 %1, label %return, label %bb
bb: ; preds = %bb, %entry
%i.03 = phi i32 [ 0, %entry ], [ %3, %bb ] ; <i32> [#uses=3]
tail call void @bar( i32 %i.03 ) nounwind
uitofp i32 %i.03 to double ; <double>:2 [#uses=1]
tail call void @foo( double %2 ) nounwind
add i32 %i.03, 1 ; <i32>:3 [#uses=2]
tail call i32 (...)* @nn( ) nounwind ; <i32>:4 [#uses=1]
icmp ugt i32 %4, %3 ; <i1>:5 [#uses=1]
br i1 %5, label %bb, label %return
return: ; preds = %bb, %entry
ret void
}
; Unable to eliminate cast due to overflow.
define void @foobar4() nounwind {
entry:
br label %bb.nph
bb.nph: ; preds = %entry
br label %bb
bb: ; preds = %bb, %bb.nph
%i.03 = phi i8 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i32> [#uses=3]
%tmp2 = sext i8 %i.03 to i32 ; <i32>:0 [#uses=1]
tail call void @bar( i32 %tmp2 ) nounwind
%tmp3 = uitofp i8 %i.03 to double ; <double>:1 [#uses=1]
tail call void @foo( double %tmp3 ) nounwind
%indvar.next = add i8 %i.03, 1 ; <i32> [#uses=2]
%tmp = sext i8 %indvar.next to i32
%exitcond = icmp eq i32 %tmp, 32767 ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
declare void @bar(i32)
declare void @foo(double)
declare i32 @nn(...)