forked from OSchip/llvm-project
74 lines
2.0 KiB
LLVM
74 lines
2.0 KiB
LLVM
; Inlining in the presence of recursion presents special challenges that we
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; test here.
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;
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; RUN: opt -inline -S < %s | FileCheck %s
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; RUN: opt -passes='cgscc(inline)' -S < %s | FileCheck %s
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define i32 @large_stack_callee(i32 %param) {
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; CHECK-LABEL: define i32 @large_stack_callee(
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entry:
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%yyy = alloca [100000 x i8]
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%r = bitcast [100000 x i8]* %yyy to i8*
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call void @bar(i8* %r)
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ret i32 4
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}
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; Test a recursive function which calls another function with a large stack. In
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; addition to not inlining the recursive call, we should also not inline the
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; large stack allocation into a potentially recursive frame.
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define i32 @large_stack_recursive_caller(i32 %param) {
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; CHECK-LABEL: define i32 @large_stack_recursive_caller(
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entry:
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; CHECK-NEXT: entry:
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; CHECK-NOT: alloca
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%t = call i32 @foo(i32 %param)
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%cmp = icmp eq i32 %t, -1
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br i1 %cmp, label %exit, label %cont
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cont:
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%r = call i32 @large_stack_recursive_caller(i32 %t)
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; CHECK: call i32 @large_stack_recursive_caller
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%f = call i32 @large_stack_callee(i32 %r)
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; CHECK: call i32 @large_stack_callee
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br label %exit
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exit:
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ret i32 4
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}
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declare void @bar(i8* %in)
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declare i32 @foo(i32 %param)
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; Check that when inlining a non-recursive path into a function's own body that
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; we get the re-mapping of instructions correct.
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define i32 @test_recursive_inlining_remapping(i1 %init, i8* %addr) {
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; CHECK-LABEL: define i32 @test_recursive_inlining_remapping(
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bb:
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%n = alloca i32
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br i1 %init, label %store, label %load
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; CHECK-NOT: alloca
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;
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; CHECK: %[[N:.*]] = alloca i32
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; CHECK-NEXT: br i1 %init,
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store:
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store i32 0, i32* %n
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%cast = bitcast i32* %n to i8*
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%v = call i32 @test_recursive_inlining_remapping(i1 false, i8* %cast)
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ret i32 %v
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; CHECK-NOT: call
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;
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; CHECK: store i32 0, i32* %[[N]]
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; CHECK-NEXT: %[[CAST:.*]] = bitcast i32* %[[N]] to i8*
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; CHECK-NEXT: %[[INLINED_LOAD:.*]] = load i32, i32* %[[N]]
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; CHECK-NEXT: ret i32 %[[INLINED_LOAD]]
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;
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; CHECK-NOT: call
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load:
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%castback = bitcast i8* %addr to i32*
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%n.load = load i32, i32* %castback
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ret i32 %n.load
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}
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