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2741d2cfdf
This cleans up the method used to find trip counts in order to form CTR loops on PPC. This refactoring allows the pass to find loops which have a constant trip count but also happen to end with a comparison to zero. This also adds explicit FIXMEs to mark two different classes of loops that are currently ignored. In addition, we now search through all potential induction operations instead of just the first. Also, we check the predicate code on the conditional branch and abort the transformation if the code is not EQ or NE, and we then make sure that the branch to be transformed matches the condition register defined by the comparison (multiple possible comparisons will be considered). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158607 91177308-0d34-0410-b5e6-96231b3b80d8
135 lines
6.3 KiB
LLVM
135 lines
6.3 KiB
LLVM
; ModuleID = 'SingleSource/Regression/C/sumarray2d.c'
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; RUN: llc < %s -march=ppc64 | FileCheck %s
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@.str = private unnamed_addr constant [23 x i8] c"Sum(Array[%d,%d] = %d\0A\00", align 1
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define i32 @SumArray([100 x i32]* nocapture %Array, i32 %NumI, i32 %NumJ) nounwind readonly {
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entry:
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%cmp12 = icmp eq i32 %NumI, 0
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br i1 %cmp12, label %for.end8, label %for.cond1.preheader.lr.ph
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for.cond1.preheader.lr.ph: ; preds = %entry
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%cmp29 = icmp eq i32 %NumJ, 0
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br i1 %cmp29, label %for.inc6, label %for.body3.lr.ph.us
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for.inc6.us: ; preds = %for.body3.us
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%indvars.iv.next17 = add i64 %indvars.iv16, 1
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%lftr.wideiv18 = trunc i64 %indvars.iv.next17 to i32
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%exitcond19 = icmp eq i32 %lftr.wideiv18, %NumI
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br i1 %exitcond19, label %for.end8, label %for.body3.lr.ph.us
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for.body3.us: ; preds = %for.body3.us, %for.body3.lr.ph.us
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%indvars.iv = phi i64 [ 0, %for.body3.lr.ph.us ], [ %indvars.iv.next, %for.body3.us ]
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%Result.111.us = phi i32 [ %Result.014.us, %for.body3.lr.ph.us ], [ %add.us, %for.body3.us ]
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%arrayidx5.us = getelementptr inbounds [100 x i32]* %Array, i64 %indvars.iv16, i64 %indvars.iv
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%0 = load i32* %arrayidx5.us, align 4, !tbaa !0
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%add.us = add nsw i32 %0, %Result.111.us
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %NumJ
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br i1 %exitcond, label %for.inc6.us, label %for.body3.us
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for.body3.lr.ph.us: ; preds = %for.inc6.us, %for.cond1.preheader.lr.ph
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%indvars.iv16 = phi i64 [ %indvars.iv.next17, %for.inc6.us ], [ 0, %for.cond1.preheader.lr.ph ]
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%Result.014.us = phi i32 [ %add.us, %for.inc6.us ], [ 0, %for.cond1.preheader.lr.ph ]
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br label %for.body3.us
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for.inc6: ; preds = %for.inc6, %for.cond1.preheader.lr.ph
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%i.013 = phi i32 [ %inc7, %for.inc6 ], [ 0, %for.cond1.preheader.lr.ph ]
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%inc7 = add i32 %i.013, 1
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%exitcond20 = icmp eq i32 %inc7, %NumI
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br i1 %exitcond20, label %for.end8, label %for.inc6
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for.end8: ; preds = %for.inc6.us, %for.inc6, %entry
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%Result.0.lcssa = phi i32 [ 0, %entry ], [ %add.us, %for.inc6.us ], [ 0, %for.inc6 ]
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ret i32 %Result.0.lcssa
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; CHECK: @SumArray
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; CHECK: mtctr
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; CHECK: bdnz
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}
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define i32 @main() nounwind {
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entry:
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%Array = alloca [100 x [100 x i32]], align 4
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv33 = phi i64 [ 0, %entry ], [ %indvars.iv.next34, %for.body ]
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%0 = trunc i64 %indvars.iv33 to i32
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%sub = sub i32 0, %0
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%arrayidx2 = getelementptr inbounds [100 x [100 x i32]]* %Array, i64 0, i64 %indvars.iv33, i64 %indvars.iv33
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store i32 %sub, i32* %arrayidx2, align 4, !tbaa !0
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%indvars.iv.next34 = add i64 %indvars.iv33, 1
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%lftr.wideiv35 = trunc i64 %indvars.iv.next34 to i32
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%exitcond36 = icmp eq i32 %lftr.wideiv35, 100
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br i1 %exitcond36, label %for.cond6.preheader, label %for.body
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for.cond6.preheader: ; preds = %for.body, %for.inc17
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%indvars.iv29 = phi i64 [ %indvars.iv.next30, %for.inc17 ], [ 0, %for.body ]
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br label %for.body8
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for.body8: ; preds = %for.inc14, %for.cond6.preheader
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%indvars.iv = phi i64 [ 0, %for.cond6.preheader ], [ %indvars.iv.next, %for.inc14 ]
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%1 = trunc i64 %indvars.iv to i32
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%2 = trunc i64 %indvars.iv29 to i32
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%cmp9 = icmp eq i32 %1, %2
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br i1 %cmp9, label %for.inc14, label %if.then
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if.then: ; preds = %for.body8
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%3 = add i64 %indvars.iv, %indvars.iv29
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%arrayidx13 = getelementptr inbounds [100 x [100 x i32]]* %Array, i64 0, i64 %indvars.iv29, i64 %indvars.iv
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%4 = trunc i64 %3 to i32
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store i32 %4, i32* %arrayidx13, align 4, !tbaa !0
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br label %for.inc14
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for.inc14: ; preds = %for.body8, %if.then
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv27 = trunc i64 %indvars.iv.next to i32
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%exitcond28 = icmp eq i32 %lftr.wideiv27, 100
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br i1 %exitcond28, label %for.inc17, label %for.body8
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for.inc17: ; preds = %for.inc14
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%indvars.iv.next30 = add i64 %indvars.iv29, 1
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%lftr.wideiv31 = trunc i64 %indvars.iv.next30 to i32
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%exitcond32 = icmp eq i32 %lftr.wideiv31, 100
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br i1 %exitcond32, label %for.body3.lr.ph.us.i, label %for.cond6.preheader
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for.inc6.us.i: ; preds = %for.body3.us.i
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%indvars.iv.next17.i = add i64 %indvars.iv16.i, 1
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%lftr.wideiv24 = trunc i64 %indvars.iv.next17.i to i32
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%exitcond25 = icmp eq i32 %lftr.wideiv24, 100
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br i1 %exitcond25, label %SumArray.exit, label %for.body3.lr.ph.us.i
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for.body3.us.i: ; preds = %for.body3.lr.ph.us.i, %for.body3.us.i
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%indvars.iv.i = phi i64 [ 0, %for.body3.lr.ph.us.i ], [ %indvars.iv.next.i, %for.body3.us.i ]
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%Result.111.us.i = phi i32 [ %Result.014.us.i, %for.body3.lr.ph.us.i ], [ %add.us.i, %for.body3.us.i ]
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%arrayidx5.us.i = getelementptr inbounds [100 x [100 x i32]]* %Array, i64 0, i64 %indvars.iv16.i, i64 %indvars.iv.i
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%5 = load i32* %arrayidx5.us.i, align 4, !tbaa !0
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%add.us.i = add nsw i32 %5, %Result.111.us.i
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%indvars.iv.next.i = add i64 %indvars.iv.i, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next.i to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 100
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br i1 %exitcond, label %for.inc6.us.i, label %for.body3.us.i
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for.body3.lr.ph.us.i: ; preds = %for.inc17, %for.inc6.us.i
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%indvars.iv16.i = phi i64 [ %indvars.iv.next17.i, %for.inc6.us.i ], [ 0, %for.inc17 ]
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%Result.014.us.i = phi i32 [ %add.us.i, %for.inc6.us.i ], [ 0, %for.inc17 ]
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br label %for.body3.us.i
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SumArray.exit: ; preds = %for.inc6.us.i
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%call20 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([23 x i8]* @.str, i64 0, i64 0), i32 100, i32 100, i32 %add.us.i) nounwind
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ret i32 0
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; CHECK: @main
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; CHECK: mtctr
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; CHECK: bdnz
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}
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declare i32 @printf(i8* nocapture, ...) nounwind
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA"}
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