78 lines
2.3 KiB
LLVM
78 lines
2.3 KiB
LLVM
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; RUN: llc < %s -asm-verbose=false -verify-machineinstrs | FileCheck %s
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;; Test that a small but nontrivial switch in a loop (like in a
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;; bytecode interpreter) lowers reasonably without any irreducible
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;; control flow being introduced.
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32"
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declare void @a(i32*)
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declare void @b(i32*)
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; CHECK-LABEL: switch_in_loop:
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; CHECK-NEXT: .functype switch_in_loop (i32, i32) -> (i32)
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; CHECK: global.get __stack_pointer
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; CHECK: global.set __stack_pointer
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; CHECK: block
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; CHECK: br_if 0
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; CHECK: .LBB0_2:
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; CHECK: loop
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; CHECK: block
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; CHECK: block
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; CHECK: block
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; CHECK: br_table {0, 1, 2}
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; CHECK: .LBB0_3:
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; CHECK: end_block
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; CHECK: call a
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; CHECK: br 1
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; CHECK: .LBB0_4:
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; CHECK: end_block
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; CHECK: call b
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; CHECK: .LBB0_5:
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; CHECK: end_block
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; CHECK: br_if 0
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; CHECK: end_loop
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; CHECK: .LBB0_7:
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; CHECK: end_block
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; CHECK: global.set __stack_pointer
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; CHECK: end_function
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define i32 @switch_in_loop(i32* %ops, i32 %len) {
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entry:
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%res = alloca i32
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%0 = bitcast i32* %res to i8*
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store i32 0, i32* %res
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%cmp6 = icmp sgt i32 %len, 0
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br i1 %cmp6, label %for.body, label %for.cond.cleanup
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for.cond.cleanup.loopexit: ; preds = %sw.epilog
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%.pre = load i32, i32* %res
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br label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
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%1 = phi i32 [ %.pre, %for.cond.cleanup.loopexit ], [ 0, %entry ]
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ret i32 %1
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for.body: ; preds = %entry, %sw.epilog
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%i.07 = phi i32 [ %inc, %sw.epilog ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %ops, i32 %i.07
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%2 = load i32, i32* %arrayidx
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switch i32 %2, label %sw.epilog [
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i32 0, label %sw.bb
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i32 1, label %sw.bb1
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]
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sw.bb: ; preds = %for.body
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call void @a(i32* nonnull %res)
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br label %sw.epilog
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sw.bb1: ; preds = %for.body
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call void @b(i32* nonnull %res)
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br label %sw.epilog
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sw.epilog: ; preds = %for.body, %sw.bb1, %sw.bb
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%inc = add nuw nsw i32 %i.07, 1
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%exitcond = icmp eq i32 %inc, %len
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br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
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}
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