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| author | Sanne Wouda <sanne.wouda@arm.com> | 2017-02-03 11:15:53 +0000 |
|---|---|---|
| committer | Sanne Wouda <sanne.wouda@arm.com> | 2017-02-03 11:15:53 +0000 |
| commit | a9941857579f17057994a270dba17fee6b9fd281 (patch) | |
| tree | 3f341d0b562dff4521313aa1b179ca54916e53a4 /llvm/test | |
| parent | 57b63d6ade0f370b47c422ea62c0bdce5467f3c7 (diff) | |
| download | bcm5719-llvm-a9941857579f17057994a270dba17fee6b9fd281.tar.gz bcm5719-llvm-a9941857579f17057994a270dba17fee6b9fd281.zip | |
[ARM] Change TCReturn to tBL if tailcall optimization fails.
Summary:
The tail call optimisation is performed before register allocation, so
at that point we don't know if LR is being spilt or not. If LR was spilt
to the stack, then we cannot do a tail call optimisation. That would
involve popping back into LR which is not possible in Thumb1 code.
Reviewers: rengolin, jmolloy, rovka, olista01
Reviewed By: olista01
Subscribers: llvm-commits, aemerson
Differential Revision: https://reviews.llvm.org/D29020
llvm-svn: 294000
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/ARM/v8m-tail-call.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/v8m-tail-call.ll b/llvm/test/CodeGen/ARM/v8m-tail-call.ll new file mode 100644 index 00000000000..2c2c795838f --- /dev/null +++ b/llvm/test/CodeGen/ARM/v8m-tail-call.ll @@ -0,0 +1,23 @@ +; RUN: llc %s -o - -mtriple=thumbv8m.base | FileCheck %s + +define void @test() { +; CHECK-LABEL: test: +entry: + %call = tail call i32 @foo() + %tail = tail call i32 @foo() + ret void +; CHECK: bl foo +; CHECK: bl foo +; CHECK-NOT: b foo +} + +define void @test2() { +; CHECK-LABEL: test2: +entry: + %tail = tail call i32 @foo() + ret void +; CHECK: b foo +; CHECK-NOT: bl foo +} + +declare i32 @foo() |
