66 lines
2.4 KiB
LLVM
66 lines
2.4 KiB
LLVM
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; RUN: opt -O3 -S -analyze -scalar-evolution < %s -enable-new-pm=0 | FileCheck %s
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; RUN: opt -passes='default<O3>,print<scalar-evolution>' -S < %s 2>&1 | FileCheck %s
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;
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; This file contains phase ordering tests for scalar evolution.
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; Test that the standard passes don't obfuscate the IR so scalar evolution can't
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; recognize expressions.
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; CHECK: test1
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; The loop body contains two increments by %div.
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; Make sure that 2*%div is recognizable, and not expressed as a bit mask of %d.
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; CHECK: --> {%p,+,(8 * (%d /u 4))}
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define void @test1(i64 %d, i32* %p) nounwind uwtable ssp {
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entry:
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%div = udiv i64 %d, 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ]
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%cmp = icmp ne i32 %i.0, 64
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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store i32 0, i32* %p.addr.0, align 4
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%add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 %div
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store i32 1, i32* %add.ptr, align 4
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%add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i64 %div
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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; CHECK: test1a
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; Same thing as test1, but it is even more tempting to fold 2 * (%d /u 2)
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; CHECK: --> {%p,+,(8 * (%d /u 2))}
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define void @test1a(i64 %d, i32* %p) nounwind uwtable ssp {
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entry:
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%div = udiv i64 %d, 2
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%p.addr.0 = phi i32* [ %p, %entry ], [ %add.ptr1, %for.inc ]
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%cmp = icmp ne i32 %i.0, 64
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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store i32 0, i32* %p.addr.0, align 4
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%add.ptr = getelementptr inbounds i32, i32* %p.addr.0, i64 %div
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store i32 1, i32* %add.ptr, align 4
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%add.ptr1 = getelementptr inbounds i32, i32* %add.ptr, i64 %div
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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