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| author | Tim Northover <tnorthover@apple.com> | 2018-04-05 14:26:06 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2018-04-05 14:26:06 +0000 |
| commit | b30388bf11aa7f95c8a92585130962d5e434406c (patch) | |
| tree | cee4177a649c1af70e14be8d6d95065b0bfba1ce /llvm/test/CodeGen/AArch64 | |
| parent | 62c4805c1f4dbba880fa4fffe85e9e5a4057f798 (diff) | |
| download | bcm5719-llvm-b30388bf11aa7f95c8a92585130962d5e434406c.tar.gz bcm5719-llvm-b30388bf11aa7f95c8a92585130962d5e434406c.zip | |
ARM: Do not spill CSR to stack on entry to noreturn functions
A noreturn nounwind function can be expected to never return in any way, and by
never returning it will also never have to restore any callee-saved registers
for its caller. This makes it possible to skip spills of those registers during
function entry, saving some stack space and time in the process. This is rather
useful for embedded targets with limited stack space.
Should fix PR9970.
Patch by myeisha (pmb).
llvm-svn: 329287
Diffstat (limited to 'llvm/test/CodeGen/AArch64')
| -rw-r--r-- | llvm/test/CodeGen/AArch64/arm64-shrink-wrapping.ll | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/test/CodeGen/AArch64/arm64-shrink-wrapping.ll b/llvm/test/CodeGen/AArch64/arm64-shrink-wrapping.ll index 0253229c0d7..7ae739ebf4d 100644 --- a/llvm/test/CodeGen/AArch64/arm64-shrink-wrapping.ll +++ b/llvm/test/CodeGen/AArch64/arm64-shrink-wrapping.ll @@ -281,7 +281,7 @@ declare void @somethingElse(...) ; Shift second argument by one and store into returned register. ; ENABLE: lsl w0, w1, #1 ; ENABLE: ret -define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) #0 { +define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) nounwind { entry: %tobool = icmp eq i32 %cond, 0 br i1 %tobool, label %if.else, label %if.then @@ -355,7 +355,7 @@ entry: ; CHECK-NEXT: lsl w0, w1, #1 ; DISABLE-NEXT: add sp, sp, #16 ; CHECK-NEXT: ret -define i32 @variadicFunc(i32 %cond, i32 %count, ...) #0 { +define i32 @variadicFunc(i32 %cond, i32 %count, ...) nounwind { entry: %ap = alloca i8*, align 8 %tobool = icmp eq i32 %cond, 0 |
