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https://github.com/RPCS3/llvm-mirror.git
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42e839cbcd
When we switch to opaque pointer types we will need some way to describe how many bytes a 'byval' parameter should occupy on the stack. This adds a (for now) optional extra type parameter. If present, the type must match the pointee type of the argument. The original commit did not remap byval types when linking modules, which broke LTO. This version fixes that. Note to front-end maintainers: if this causes test failures, it's probably because the "byval" attribute is printed after attributes without any parameter after this change. llvm-svn: 362128
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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