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489a03c754
The original change broke clang side tests. I will be submitting those momentarily. This change includes post commit feedback on the original change from from Pete Cooper. Original Submission comments: If a parameter to a function is known non-null, use the existing parameter attributes to record that fact at the call site. This has no optimization benefit by itself - that I know of - but is an enabling change for http://reviews.llvm.org/D9129. Differential Revision: http://reviews.llvm.org/D9132 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239849 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; RUN: opt < %s -basicaa -tailcallelim -inline -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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