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https://github.com/c64scene-ar/llvm-6502.git
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011cb4d5bd
There's a missed optimization opportunity where we could look at the full chain of computation and take the intersection of the flags instead of only looking one instruction deep. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232134 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
3.2 KiB
LLVM
91 lines
3.2 KiB
LLVM
; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
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; PR1101
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@A = weak global [1000 x i32] zeroinitializer, align 32
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; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'test1':
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; CHECK: backedge-taken count is 10000
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define void @test1(i32 %N) {
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entry:
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br label %bb3
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bb: ; preds = %bb3
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%tmp = getelementptr [1000 x i32], [1000 x i32]* @A, i32 0, i32 %i.0 ; <i32*> [#uses=1]
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store i32 123, i32* %tmp
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%tmp2 = add i32 %i.0, 1 ; <i32> [#uses=1]
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br label %bb3
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bb3: ; preds = %bb, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %tmp2, %bb ] ; <i32> [#uses=3]
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%tmp3 = icmp sle i32 %i.0, 9999 ; <i1> [#uses=1]
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br i1 %tmp3, label %bb, label %bb5
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bb5: ; preds = %bb3
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br label %return
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return: ; preds = %bb5
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ret void
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}
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; PR22795
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; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'test2':
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; CHECK: %iv = phi i32 [ -1, %entry ], [ %next.1, %for.inc.1 ]
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; CHECK-NEXT: --> {-1,+,2}<%preheader> U: full-set S: full-set Exits: 13
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define i32 @test2() {
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entry:
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%bins = alloca [16 x i64], align 16
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%0 = bitcast [16 x i64]* %bins to i8*
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call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 128, i32 16, i1 false)
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br label %preheader
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preheader: ; preds = %for.inc.1, %entry
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%v11 = phi i64 [ 0, %entry ], [ %next12.1, %for.inc.1 ]
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%iv = phi i32 [ -1, %entry ], [ %next.1, %for.inc.1 ]
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%cmp = icmp sgt i64 %v11, 0
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br i1 %cmp, label %for.body, label %for.inc
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for.body: ; preds = %preheader
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%zext = zext i32 %iv to i64
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%arrayidx = getelementptr [16 x i64], [16 x i64]* %bins, i64 0, i64 %v11
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%loaded = load i64, i64* %arrayidx, align 8
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%add = add i64 %loaded, 1
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%add2 = add i64 %add, %zext
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store i64 %add2, i64* %arrayidx, align 8
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br label %for.inc
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for.inc: ; preds = %for.body, %preheader
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%next12 = add nuw nsw i64 %v11, 1
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%next = add nsw i32 %iv, 1
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br i1 true, label %for.body.1, label %for.inc.1
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end: ; preds = %for.inc.1
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%arrayidx8 = getelementptr [16 x i64], [16 x i64]* %bins, i64 0, i64 2
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%load = load i64, i64* %arrayidx8, align 16
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%shr4 = lshr i64 %load, 32
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%conv = trunc i64 %shr4 to i32
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ret i32 %conv
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for.body.1: ; preds = %for.inc
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%zext.1 = zext i32 %next to i64
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%arrayidx.1 = getelementptr [16 x i64], [16 x i64]* %bins, i64 0, i64 %next12
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%loaded.1 = load i64, i64* %arrayidx.1, align 8
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%add.1 = add i64 %loaded.1, 1
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%add2.1 = add i64 %add.1, %zext.1
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store i64 %add2.1, i64* %arrayidx.1, align 8
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br label %for.inc.1
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for.inc.1: ; preds = %for.body.1, %for.inc
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%next12.1 = add nuw nsw i64 %next12, 1
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%next.1 = add nuw nsw i32 %next, 1
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%exitcond.1 = icmp eq i64 %next12.1, 16
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br i1 %exitcond.1, label %end, label %preheader
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}
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; Function Attrs: nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #0
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