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| author | Momchil Velikov <momchil.velikov@arm.com> | 2018-01-08 11:32:37 +0000 |
|---|---|---|
| committer | Momchil Velikov <momchil.velikov@arm.com> | 2018-01-08 11:32:37 +0000 |
| commit | d17dabca31dc744ddeaf14610c948d5c8f4e0326 (patch) | |
| tree | 3deda9916c966e42554a96192c3b953b9ec718c4 /llvm/test/CodeGen/Thumb | |
| parent | 51164c409d2b1d027abbf1020fcd9333f92eaf33 (diff) | |
| download | bcm5719-llvm-d17dabca31dc744ddeaf14610c948d5c8f4e0326.tar.gz bcm5719-llvm-d17dabca31dc744ddeaf14610c948d5c8f4e0326.zip | |
[ARM] Fix PR35481
This patch allows `r7` to be used, regardless of its use as a frame pointer, as
a temporary register when popping `lr`, and also falls back to using a high
temporary register if, for some reason, we weren't able to find a suitable low
one.
Differential revision: https://reviews.llvm.org/D40961
Fixes https://bugs.llvm.org/show_bug.cgi?id=35481
llvm-svn: 321989
Diffstat (limited to 'llvm/test/CodeGen/Thumb')
| -rw-r--r-- | llvm/test/CodeGen/Thumb/PR35481.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Thumb/PR35481.ll b/llvm/test/CodeGen/Thumb/PR35481.ll new file mode 100644 index 00000000000..99137c63d96 --- /dev/null +++ b/llvm/test/CodeGen/Thumb/PR35481.ll @@ -0,0 +1,24 @@ +; RUN: llc -mtriple thumbv4t-eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V4T +; RUN: llc -mtriple armv8m.base-eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V8M + +target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" + +; Function Attrs: nounwind +define <4 x i32> @f() local_unnamed_addr #0 { +entry: + %call = tail call i32 @h(i32 1) + %call1 = tail call <4 x i32> @g(i32 %call, i32 2, i32 3, i32 4) + ret <4 x i32> %call1 +; CHECK: ldr r7, [sp, #4] +; CHECK-NEXT: mov lr, r7 +; CHECK-NEXT: pop {r7} +; CHECK-NEXT: add sp, #4 +; CHECK-V47: bx lr +; CHECK-V8M: b g +} + +declare <4 x i32> @g(i32, i32, i32, i32) local_unnamed_addr + +declare i32 @h(i32) local_unnamed_addr + +attributes #0 = { "disable-tail-calls"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" } |
