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
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; RUN: opt -S -structurizecfg %s -o - | FileCheck %s
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; CHECK-NOT: br i1 true
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define void @blam(i32 addrspace(1)* nocapture %arg, float %arg1, float %arg2) {
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; CHECK: bb:
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bb:
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br label %bb3
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; CHECK: bb3:
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; CHECK: %tmp4.inv = xor i1 %tmp4, true
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; CHECK: br i1 %tmp4.inv, label %bb5, label %Flow
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bb3: ; preds = %bb7, %bb
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%tmp = phi i64 [ 0, %bb ], [ %tmp8, %bb7 ]
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%tmp4 = fcmp ult float %arg1, 3.500000e+00
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br i1 %tmp4, label %bb7, label %bb5
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; CHECK: bb5:
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; CHECK: %tmp6 = fcmp uge float 0.000000e+00, %arg2
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; CHECK: br label %Flow
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bb5: ; preds = %bb3
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%tmp6 = fcmp olt float 0.000000e+00, %arg2
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br i1 %tmp6, label %bb10, label %bb7
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; CHECK: Flow:
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; CHECK: %0 = phi i1 [ %tmp6, %bb5 ], [ %tmp4, %bb3 ]
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; CHECK: br i1 %0, label %bb7, label %Flow1
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; CHECK: bb7:
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; CHECK: br label %Flow1
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bb7: ; preds = %bb5, %bb3
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%tmp8 = add nuw nsw i64 %tmp, 1
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%tmp9 = icmp slt i64 %tmp8, 5
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br i1 %tmp9, label %bb3, label %bb10
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; CHECK: Flow1:
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; CHECK: %3 = phi i1 [ %tmp9, %bb7 ], [ true, %Flow ]
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; CHECK: br i1 %3, label %bb10, label %bb3
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; CHECK: bb10:
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bb10: ; preds = %bb7, %bb5
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%tmp11 = phi i32 [ 15, %bb5 ], [ 255, %bb7 ]
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store i32 %tmp11, i32 addrspace(1)* %arg, align 4
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ret void
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}
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