diff options
Diffstat (limited to 'test/Transforms/IndVarSimplify/preserve-signed-wrap.ll')
| -rw-r--r-- | test/Transforms/IndVarSimplify/preserve-signed-wrap.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/preserve-signed-wrap.ll b/test/Transforms/IndVarSimplify/preserve-signed-wrap.ll new file mode 100644 index 0000000..9e46a78 --- /dev/null +++ b/test/Transforms/IndVarSimplify/preserve-signed-wrap.ll @@ -0,0 +1,38 @@ +; RUN: opt < %s -indvars -S > %t +; RUN: grep sext %t | count 1 +; RUN: grep phi %t | count 1 +; RUN: grep {phi i64} %t + +; Indvars should insert a 64-bit induction variable to eliminate the +; sext for the addressing, however it shouldn't eliminate the sext +; on the other phi, since that value undergoes signed wrapping. + +define void @foo(i32* nocapture %d, i32 %n) nounwind { +entry: + %0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1] + br i1 %0, label %bb.nph, label %return + +bb.nph: ; preds = %entry + br label %bb + +bb: ; preds = %bb1, %bb.nph + %i.02 = phi i32 [ %5, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=2] + %p.01 = phi i8 [ %4, %bb1 ], [ -1, %bb.nph ] ; <i8> [#uses=2] + %1 = sext i8 %p.01 to i32 ; <i32> [#uses=1] + %2 = sext i32 %i.02 to i64 ; <i64> [#uses=1] + %3 = getelementptr i32* %d, i64 %2 ; <i32*> [#uses=1] + store i32 %1, i32* %3, align 4 + %4 = add i8 %p.01, 1 ; <i8> [#uses=1] + %5 = add i32 %i.02, 1 ; <i32> [#uses=2] + br label %bb1 + +bb1: ; preds = %bb + %6 = icmp slt i32 %5, %n ; <i1> [#uses=1] + br i1 %6, label %bb, label %bb1.return_crit_edge + +bb1.return_crit_edge: ; preds = %bb1 + br label %return + +return: ; preds = %bb1.return_crit_edge, %entry + ret void +} |