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Diffstat (limited to 'test/Transforms/PhaseOrdering/scev.ll')
-rw-r--r-- | test/Transforms/PhaseOrdering/scev.ll | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/test/Transforms/PhaseOrdering/scev.ll b/test/Transforms/PhaseOrdering/scev.ll new file mode 100644 index 0000000..c731280 --- /dev/null +++ b/test/Transforms/PhaseOrdering/scev.ll @@ -0,0 +1,64 @@ +; RUN: opt -O3 -S -analyze -scalar-evolution %s | FileCheck %s +; +; This file contains phase ordering tests for scalar evolution. +; Test that the standard passes don't obfuscate the IR so scalar evolution can't +; recognize expressions. + +; CHECK: test1 +; The loop body contains two increments by %div. +; Make sure that 2*%div is recognizable, and not expressed as a bit mask of %d. +; CHECK: --> {%p,+,(2 * (%d /u 4) * sizeof(i32))} +define void @test1(i64 %d, i32* %p) nounwind uwtable ssp { +entry: + %div = udiv i64 %d, 4 + br label %for.cond + +for.cond: ; preds = %for.inc, %entry + %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] + %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] + %cmp = icmp ne i32 %i.0, 64 + br i1 %cmp, label %for.body, label %for.end + +for.body: ; preds = %for.cond + store i32 0, i32* %p.addr.0, align 4 + %add.ptr = getelementptr inbounds i32* %p.addr.0, i64 %div + store i32 1, i32* %add.ptr, align 4 + %add.ptr1 = getelementptr inbounds i32* %add.ptr, i64 %div + br label %for.inc + +for.inc: ; preds = %for.body + %inc = add i32 %i.0, 1 + br label %for.cond + +for.end: ; preds = %for.cond + ret void +} + +; CHECK: test1a +; Same thing as test1, but it is even more tempting to fold 2 * (%d /u 2) +; CHECK: --> {%p,+,(2 * (%d /u 2) * sizeof(i32))} +define void @test1a(i64 %d, i32* %p) nounwind uwtable ssp { +entry: + %div = udiv i64 %d, 2 + br label %for.cond + +for.cond: ; preds = %for.inc, %entry + %p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ] + %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] + %cmp = icmp ne i32 %i.0, 64 + br i1 %cmp, label %for.body, label %for.end + +for.body: ; preds = %for.cond + store i32 0, i32* %p.addr.0, align 4 + %add.ptr = getelementptr inbounds i32* %p.addr.0, i64 %div + store i32 1, i32* %add.ptr, align 4 + %add.ptr1 = getelementptr inbounds i32* %add.ptr, i64 %div + br label %for.inc + +for.inc: ; preds = %for.body + %inc = add i32 %i.0, 1 + br label %for.cond + +for.end: ; preds = %for.cond + ret void +} |