d2e5d3512b
In some cases StructurizeCFG inserts i1 xor instructions to invert predicates. Add a quick loop to clean these up afterwards if we can get away with modifying an existing compare instruction instead. (StructurizeCFG is generally run late in the pipeline so instcombine does not clean them up for us.) Differential Revision: https://reviews.llvm.org/D118623
102 lines
4.1 KiB
LLVM
102 lines
4.1 KiB
LLVM
; RUN: opt -S -structurizecfg %s -o - | FileCheck %s
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; The structurize cfg pass used to do a post-order traversal to generate a list
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; of ; basic blocks and then operate on the list in reverse. This led to bugs,
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; because sometimes successors would be visited before their predecessors.
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; The fix for this was to do a reverse post-order traversal which is what the
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; algorithm requires.
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; Function Attrs: nounwind
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define void @test(float* nocapture %out, i32 %K1, float* nocapture readonly %nr) {
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; CHECK: entry:
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; CHECK: br label %for.body
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entry:
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br label %for.body
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; CHECK: for.body:
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; CHECK: br i1 %cmp1.inv, label %lor.lhs.false, label %Flow
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for.body: ; preds = %for.body.backedge, %entry
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%indvars.iv = phi i64 [ %indvars.iv.be, %for.body.backedge ], [ 1, %entry ]
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%best_val.027 = phi float [ %best_val.027.be, %for.body.backedge ], [ 5.000000e+01, %entry ]
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%prev_start.026 = phi i32 [ %tmp26, %for.body.backedge ], [ 0, %entry ]
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%best_count.025 = phi i32 [ %best_count.025.be, %for.body.backedge ], [ 0, %entry ]
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%tmp0 = trunc i64 %indvars.iv to i32
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%cmp1 = icmp eq i32 %tmp0, %K1
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br i1 %cmp1, label %if.then, label %lor.lhs.false
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; CHECK: lor.lhs.false:
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; CHECK: br label %Flow
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lor.lhs.false: ; preds = %for.body
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%arrayidx = getelementptr inbounds float, float* %nr, i64 %indvars.iv
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%tmp1 = load float, float* %arrayidx, align 4
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%tmp2 = add nsw i64 %indvars.iv, -1
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%arrayidx2 = getelementptr inbounds float, float* %nr, i64 %tmp2
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%tmp3 = load float, float* %arrayidx2, align 4
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%cmp3 = fcmp une float %tmp1, %tmp3
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br i1 %cmp3, label %if.then, label %for.body.1
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; CHECK: Flow:
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; CHECK: br i1 %{{[0-9]+}}, label %if.then, label %Flow1
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; CHECK: if.then:
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; CHECK: br label %Flow1
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if.then: ; preds = %lor.lhs.false, %for.body
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%sub4 = sub nsw i32 %tmp0, %prev_start.026
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%tmp4 = add nsw i64 %indvars.iv, -1
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%arrayidx8 = getelementptr inbounds float, float* %nr, i64 %tmp4
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%tmp5 = load float, float* %arrayidx8, align 4
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br i1 %cmp1, label %for.end, label %for.body.1
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; CHECK: for.end:
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; CHECK: ret void
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for.end: ; preds = %for.body.1, %if.then
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%best_val.0.lcssa = phi float [ %best_val.233, %for.body.1 ], [ %tmp5, %if.then ]
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store float %best_val.0.lcssa, float* %out, align 4
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ret void
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; CHECK: Flow1
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; CHECK: br i1 %{{[0-9]}}, label %for.body.1, label %Flow2
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; CHECK: for.body.1:
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; CHECK: %cmp1.5 = icmp ne i32 %tmp22, %K1
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; CHECK: br i1 %cmp1.5, label %for.body.6, label %Flow3
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for.body.1: ; preds = %if.then, %lor.lhs.false
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%best_val.233 = phi float [ %tmp5, %if.then ], [ %best_val.027, %lor.lhs.false ]
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%best_count.231 = phi i32 [ %sub4, %if.then ], [ %best_count.025, %lor.lhs.false ]
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%indvars.iv.next.454 = add nsw i64 %indvars.iv, 5
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%tmp22 = trunc i64 %indvars.iv.next.454 to i32
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%cmp1.5 = icmp eq i32 %tmp22, %K1
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br i1 %cmp1.5, label %for.end, label %for.body.6
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; CHECK: Flow2:
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; CHECK: br i1 %{{[0-9]+}}, label %for.end, label %for.body
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; CHECK: for.body.6:
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; CHECK: br i1 %cmp5.6, label %if.then6.6, label %for.body.backedge
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for.body.6: ; preds = %for.body.1
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%indvars.iv.next.559 = add nsw i64 %indvars.iv, 6
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%tmp26 = trunc i64 %indvars.iv.next.559 to i32
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%sub4.6 = sub nsw i32 %tmp26, %tmp22
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%cmp5.6 = icmp slt i32 %best_count.231, %sub4.6
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br i1 %cmp5.6, label %if.then6.6, label %for.body.backedge
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; CHECK: if.then6.6
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; CHECK: br label %for.body.backedge
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if.then6.6: ; preds = %for.body.6
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%arrayidx8.6 = getelementptr inbounds float, float* %nr, i64 %indvars.iv.next.454
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%tmp29 = load float, float* %arrayidx8.6, align 4
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br label %for.body.backedge
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; CHECK: Flow3:
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; CHECK: br label %Flow2
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; CHECK: for.body.backedge:
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; CHECK: br label %Flow3
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for.body.backedge: ; preds = %if.then6.6, %for.body.6
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%best_val.027.be = phi float [ %tmp29, %if.then6.6 ], [ %best_val.233, %for.body.6 ]
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%best_count.025.be = phi i32 [ %sub4.6, %if.then6.6 ], [ %best_count.231, %for.body.6 ]
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%indvars.iv.be = add nsw i64 %indvars.iv, 7
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br label %for.body
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}
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