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4f0b3bb42b
Patch by Brendon Cahoon! This extends the existing LoopUnroll and LoopUnrollPass. Brendon measured no regressions in the llvm test suite with -unroll-runtime enabled. This implementation works by using the existing loop unrolling code to unroll the loop by a power-of-two (default 8). It generates an if-then-else sequence of code prior to the loop to execute the extra iterations before entering the unrolled loop. llvm-svn: 146245
45 lines
2.1 KiB
LLVM
45 lines
2.1 KiB
LLVM
; RUN: opt < %s -disable-output -stats -loop-unroll -unroll-runtime -unroll-threshold=400 -info-output-file - | FileCheck %s --check-prefix=STATS
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; Test that nested loops can be unrolled. We need to increase threshold to do it
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; STATS: 2 loop-unroll - Number of loops unrolled (completely or otherwise)
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define i32 @nested(i32* nocapture %a, i32 %n, i32 %m) nounwind uwtable readonly {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.cond1.preheader.lr.ph, label %for.end7
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for.cond1.preheader.lr.ph: ; preds = %entry
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%cmp28 = icmp sgt i32 %m, 0
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br label %for.cond1.preheader
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for.cond1.preheader: ; preds = %for.inc5, %for.cond1.preheader.lr.ph
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%indvars.iv16 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next17, %for.inc5 ]
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%sum.012 = phi i32 [ 0, %for.cond1.preheader.lr.ph ], [ %sum.1.lcssa, %for.inc5 ]
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br i1 %cmp28, label %for.body3, label %for.inc5
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for.body3: ; preds = %for.cond1.preheader, %for.body3
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 0, %for.cond1.preheader ]
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%sum.19 = phi i32 [ %add4, %for.body3 ], [ %sum.012, %for.cond1.preheader ]
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%0 = add nsw i64 %indvars.iv, %indvars.iv16
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%arrayidx = getelementptr inbounds i32* %a, i64 %0
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%1 = load i32* %arrayidx, align 4
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%add4 = add nsw i32 %1, %sum.19
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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, %m
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br i1 %exitcond, label %for.inc5, label %for.body3
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for.inc5: ; preds = %for.body3, %for.cond1.preheader
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%sum.1.lcssa = phi i32 [ %sum.012, %for.cond1.preheader ], [ %add4, %for.body3 ]
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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, %n
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br i1 %exitcond19, label %for.end7, label %for.cond1.preheader
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for.end7: ; preds = %for.inc5, %entry
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1.lcssa, %for.inc5 ]
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ret i32 %sum.0.lcssa
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}
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