forked from OSchip/llvm-project
76 lines
2.1 KiB
LLVM
76 lines
2.1 KiB
LLVM
; RUN: opt < %s -basicaa -tailcallelim -inline -instcombine -dse -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes='function(tailcallelim),cgscc(inline,function(instcombine,dse))' -S | FileCheck %s
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; PR7272
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; Calls that capture byval parameters cannot be marked as tail calls. Other
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; tails that don't capture byval parameters can still be tail calls.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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declare void @ext(i32*)
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define void @bar(i32* byval %x) {
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call void @ext(i32* %x)
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ret void
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}
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define void @foo(i32* %x) {
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; CHECK-LABEL: define void @foo(
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; CHECK: llvm.lifetime.start
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; CHECK: store i32 %2, i32* %x
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call void @bar(i32* byval %x)
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ret void
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}
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define internal void @qux(i32* byval %x) {
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call void @ext(i32* %x)
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tail call void @ext(i32* null)
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ret void
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}
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define void @frob(i32* %x) {
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; CHECK-LABEL: define void @frob(
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; CHECK: %[[POS:.*]] = alloca i32
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; CHECK: %[[VAL:.*]] = load i32, i32* %x
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; CHECK: store i32 %[[VAL]], i32* %[[POS]]
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; CHECK: {{^ *}}call void @ext(i32* nonnull %[[POS]]
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; CHECK: tail call void @ext(i32* null)
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; CHECK: ret void
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tail call void @qux(i32* byval %x)
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ret void
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}
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; A byval parameter passed into a function which is passed out as byval does
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; not block the call from being marked as tail.
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declare void @ext2(i32* byval)
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define void @bar2(i32* byval %x) {
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call void @ext2(i32* byval %x)
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ret void
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}
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define void @foobar(i32* %x) {
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; CHECK-LABEL: define void @foobar(
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; CHECK: %[[POS:.*]] = alloca i32
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; CHECK: %[[VAL:.*]] = load i32, i32* %x
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; CHECK: store i32 %[[VAL]], i32* %[[POS]]
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; CHECK: tail call void @ext2(i32* nonnull byval %[[POS]]
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; CHECK: ret void
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tail call void @bar2(i32* byval %x)
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ret void
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}
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define void @barfoo() {
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; CHECK-LABEL: define void @barfoo(
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; CHECK: %[[POS:.*]] = alloca i32
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; CHECK: %[[VAL:.*]] = load i32, i32* %x
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; CHECK: store i32 %[[VAL]], i32* %[[POS]]
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; CHECK: tail call void @ext2(i32* nonnull byval %[[POS]]
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; CHECK: ret void
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%x = alloca i32
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tail call void @bar2(i32* byval %x)
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ret void
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}
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