mirror of
https://github.com/RPCS3/llvm-mirror.git
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659a645d9a
This gets rid of a bunch of weird special cases; instead, just use SCEV rewriting for everything. In addition to being simpler, this fixes a bug where we would use the wrong stride in certain edge cases. The one bit I'm not quite sure about is the trip count handling, specifically the FIXME about overflow. In general, I think we need to widen the exit condition, but that's probably not profitable if the new type isn't legal, so we probably need a check somewhere. That said, I don't think I'm making the existing problem any worse. As a followup to this, a bunch of IV-related code in root-finding could be cleaned up; with SCEV-based rewriting, there isn't any reason to assume a loop will have exactly one or two PHI nodes. Differential Revision: https://reviews.llvm.org/D45191 llvm-svn: 335400
133 lines
4.9 KiB
LLVM
133 lines
4.9 KiB
LLVM
; RUN: opt < %s -loop-reroll -S | FileCheck %s
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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-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @foo(i32* nocapture readonly %x) #0 {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%r.029 = phi i32 [ 0, %entry ], [ %add12, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%add = add nsw i32 %0, %r.029
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%1 = or i64 %indvars.iv, 1
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%arrayidx3 = getelementptr inbounds i32, i32* %x, i64 %1
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%2 = load i32, i32* %arrayidx3, align 4
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%add4 = add nsw i32 %add, %2
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%3 = or i64 %indvars.iv, 2
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%arrayidx7 = getelementptr inbounds i32, i32* %x, i64 %3
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%4 = load i32, i32* %arrayidx7, align 4
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%add8 = add nsw i32 %add4, %4
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%5 = or i64 %indvars.iv, 3
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%arrayidx11 = getelementptr inbounds i32, i32* %x, i64 %5
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%6 = load i32, i32* %arrayidx11, align 4
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%add12 = add nsw i32 %add8, %6
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 4
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%7 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp slt i32 %7, 400
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br i1 %cmp, label %for.body, label %for.end
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; CHECK-LABEL: @foo
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; CHECK: for.body:
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; CHECK: %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
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; CHECK: %r.029 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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; CHECK: %arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvar
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; CHECK: %1 = load i32, i32* %arrayidx, align 4
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; CHECK: %add = add nsw i32 %1, %r.029
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; CHECK: %indvar.next = add i64 %indvar, 1
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; CHECK: %exitcond = icmp eq i32 %0, 399
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; CHECK: br i1 %exitcond, label %for.end, label %for.body
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; CHECK: ret
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for.end: ; preds = %for.body
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ret i32 %add12
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}
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define float @bar(float* nocapture readonly %x) #0 {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%r.029 = phi float [ 0.0, %entry ], [ %add12, %for.body ]
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%arrayidx = getelementptr inbounds float, float* %x, i64 %indvars.iv
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%0 = load float, float* %arrayidx, align 4
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%add = fadd float %0, %r.029
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%1 = or i64 %indvars.iv, 1
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%arrayidx3 = getelementptr inbounds float, float* %x, i64 %1
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%2 = load float, float* %arrayidx3, align 4
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%add4 = fadd float %add, %2
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%3 = or i64 %indvars.iv, 2
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%arrayidx7 = getelementptr inbounds float, float* %x, i64 %3
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%4 = load float, float* %arrayidx7, align 4
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%add8 = fadd float %add4, %4
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%5 = or i64 %indvars.iv, 3
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%arrayidx11 = getelementptr inbounds float, float* %x, i64 %5
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%6 = load float, float* %arrayidx11, align 4
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%add12 = fadd float %add8, %6
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 4
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%7 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp slt i32 %7, 400
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br i1 %cmp, label %for.body, label %for.end
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; CHECK-LABEL: @bar
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; CHECK: for.body:
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; CHECK: %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
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; CHECK: %r.029 = phi float [ 0.000000e+00, %entry ], [ %add, %for.body ]
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; CHECK: %arrayidx = getelementptr inbounds float, float* %x, i64 %indvar
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; CHECK: %1 = load float, float* %arrayidx, align 4
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; CHECK: %add = fadd float %1, %r.029
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; CHECK: %indvar.next = add i64 %indvar, 1
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; CHECK: %exitcond = icmp eq i32 %0, 399
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; CHECK: br i1 %exitcond, label %for.end, label %for.body
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; CHECK: ret
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for.end: ; preds = %for.body
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ret float %add12
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}
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define i32 @foo_unusedphi(i32* nocapture readonly %x) #0 {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%r.029 = phi i32 [ 0, %entry ], [ %add12, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%add = add nsw i32 %0, %0
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%1 = or i64 %indvars.iv, 1
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%arrayidx3 = getelementptr inbounds i32, i32* %x, i64 %1
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%2 = load i32, i32* %arrayidx3, align 4
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%add4 = add nsw i32 %add, %2
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%3 = or i64 %indvars.iv, 2
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%arrayidx7 = getelementptr inbounds i32, i32* %x, i64 %3
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%4 = load i32, i32* %arrayidx7, align 4
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%add8 = add nsw i32 %add4, %4
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%5 = or i64 %indvars.iv, 3
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%arrayidx11 = getelementptr inbounds i32, i32* %x, i64 %5
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%6 = load i32, i32* %arrayidx11, align 4
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%add12 = add nsw i32 %add8, %6
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 4
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%7 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp slt i32 %7, 400
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br i1 %cmp, label %for.body, label %for.end
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; CHECK-LABEL: @foo_unusedphi
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; The above is just testing for a crash - no specific output expected.
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; CHECK: ret
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for.end: ; preds = %for.body
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ret i32 %add12
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}
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attributes #0 = { nounwind readonly uwtable }
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