forked from OSchip/llvm-project
138 lines
4.5 KiB
LLVM
138 lines
4.5 KiB
LLVM
; RUN: opt -passes='default<O3>,print<scalar-evolution>' -S < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:m-p:40:64:64:32-i32:32-i16:16-i8:8-n32"
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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(i32 %d, i32* %p) nounwind uwtable ssp {
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entry:
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%div = udiv i32 %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, i32 %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, i32 %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(i32 %d, i32* %p) nounwind uwtable ssp {
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entry:
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%div = udiv i32 %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, i32 %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, i32 %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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@array = weak global [101 x i32] zeroinitializer, align 32 ; <[100 x i32]*> [#uses=1]
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; CHECK: Loop %bb: backedge-taken count is 100
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define void @test_range_ref1a(i32 %x) {
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%i.01.0 = phi i32 [ 100, %entry ], [ %tmp4, %bb ] ; <i32> [#uses=2]
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%tmp1 = getelementptr [101 x i32], [101 x i32]* @array, i32 0, i32 %i.01.0 ; <i32*> [#uses=1]
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store i32 %x, i32* %tmp1
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%tmp4 = add i32 %i.01.0, -1 ; <i32> [#uses=2]
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%tmp7 = icmp sgt i32 %tmp4, -1 ; <i1> [#uses=1]
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br i1 %tmp7, label %bb, label %return
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return: ; preds = %bb
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ret void
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}
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define i32 @test_loop_idiom_recogize(i32 %x, i32 %y, i32* %lam, i32* %alp) nounwind {
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bb1.thread:
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br label %bb1
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bb1: ; preds = %bb1, %bb1.thread
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%indvar = phi i32 [ 0, %bb1.thread ], [ %indvar.next, %bb1 ] ; <i32> [#uses=4]
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%i.0.reg2mem.0 = sub i32 255, %indvar ; <i32> [#uses=2]
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%0 = getelementptr i32, i32* %alp, i32 %i.0.reg2mem.0 ; <i32*> [#uses=1]
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%1 = load i32, i32* %0, align 4 ; <i32> [#uses=1]
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%2 = getelementptr i32, i32* %lam, i32 %i.0.reg2mem.0 ; <i32*> [#uses=1]
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store i32 %1, i32* %2, align 4
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%3 = sub i32 254, %indvar ; <i32> [#uses=1]
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%4 = icmp slt i32 %3, 0 ; <i1> [#uses=1]
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%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
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br i1 %4, label %bb2, label %bb1
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bb2: ; preds = %bb1
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%tmp10 = mul i32 %indvar, %x ; <i32> [#uses=1]
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%z.0.reg2mem.0 = add i32 %tmp10, %y ; <i32> [#uses=1]
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%5 = add i32 %z.0.reg2mem.0, %x ; <i32> [#uses=1]
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ret i32 %5
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}
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declare void @use(i1)
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declare void @llvm.experimental.guard(i1, ...)
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; This tests getRangeRef acts as intended with different idx size.
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; CHECK: Loop %loop: Unpredictable max backedge-taken count.
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define void @test_range_ref1(i8 %t) {
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entry:
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%t.ptr = inttoptr i8 %t to i8*
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%p.42 = inttoptr i8 42 to i8*
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%cmp1 = icmp slt i8* %t.ptr, %p.42
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call void(i1, ...) @llvm.experimental.guard(i1 %cmp1) [ "deopt"() ]
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br label %loop
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loop:
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%idx = phi i8* [ %t.ptr, %entry ], [ %snext, %loop ]
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%snext = getelementptr inbounds i8, i8* %idx, i64 1
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%c = icmp slt i8* %idx, %p.42
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call void @use(i1 %c)
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%be = icmp slt i8* %snext, %p.42
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br i1 %be, label %loop, label %exit
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exit:
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ret void
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}
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