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author | Dan Gohman <gohman@apple.com> | 2009-05-08 21:03:19 +0000 |
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committer | Dan Gohman <gohman@apple.com> | 2009-05-08 21:03:19 +0000 |
commit | 728c7f3059916fb0e0f98b4e9e45210fbd3f4340 (patch) | |
tree | 9200b66e8832a31ca26d82063241f563a92eda33 /test | |
parent | e688fafd3802aabab827293a520f18ec27d00fd7 (diff) | |
download | external_llvm-728c7f3059916fb0e0f98b4e9e45210fbd3f4340.zip external_llvm-728c7f3059916fb0e0f98b4e9e45210fbd3f4340.tar.gz external_llvm-728c7f3059916fb0e0f98b4e9e45210fbd3f4340.tar.bz2 |
Fold trunc casts into add-recurrence expressions, allowing the
add-recurrence to be exposed. Add a new SCEV folding rule to
help simplify expressions in the presence of these extra truncs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71264 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/Analysis/ScalarEvolution/trip-count4.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/trip-count4.ll b/test/Analysis/ScalarEvolution/trip-count4.ll new file mode 100644 index 0000000..a61d5da --- /dev/null +++ b/test/Analysis/ScalarEvolution/trip-count4.ll @@ -0,0 +1,24 @@ +; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \ +; RUN: | grep {sext.*trunc.*Exits: 11} + +; ScalarEvolution should be able to compute a loop exit value for %indvar.i8. + +define void @another_count_down_signed(double* %d, i64 %n) nounwind { +entry: + br label %loop + +loop: ; preds = %loop, %entry + %indvar = phi i64 [ %n, %entry ], [ %indvar.next, %loop ] ; <i64> [#uses=4] + %s0 = shl i64 %indvar, 8 ; <i64> [#uses=1] + %indvar.i8 = ashr i64 %s0, 8 ; <i64> [#uses=1] + %t0 = getelementptr double* %d, i64 %indvar.i8 ; <double*> [#uses=2] + %t1 = load double* %t0 ; <double> [#uses=1] + %t2 = mul double %t1, 1.000000e-01 ; <double> [#uses=1] + store double %t2, double* %t0 + %indvar.next = sub i64 %indvar, 1 ; <i64> [#uses=2] + %exitcond = icmp eq i64 %indvar.next, 10 ; <i1> [#uses=1] + br i1 %exitcond, label %return, label %loop + +return: ; preds = %loop + ret void +} |