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Cranelift: Simplify leaf functions that do not use the stack (#2960)

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* Cranelift AArch64: Simplify leaf functions that do not use the stack

Leaf functions that do not use the stack (e.g. do not clobber any
callee-saved registers) do not need a frame record.

Copyright (c) 2021, Arm Limited.
This commit is contained in:
Anton Kirilov
2021-08-27 11:12:37 +01:00
committed by GitHub
parent 12515e6646
commit 7b98be1bee
34 changed files with 650 additions and 1385 deletions
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16
cranelift/codegen/src/isa/aarch64/mod.rs
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@@ -218,15 +218,11 @@ mod test {
let buffer = backend.compile_function(&mut func, false).unwrap().buffer;
let code = &buffer.data[..];
// stp x29, x30, [sp, #-16]!
// mov x29, sp
// mov x1, #0x1234
// add w0, w0, w1
// ldp x29, x30, [sp], #16
// ret
let golden = vec![
0xfd, 0x7b, 0xbf, 0xa9, 0xfd, 0x03, 0x00, 0x91, 0x81, 0x46, 0x82, 0xd2, 0x00, 0x00,
0x01, 0x0b, 0xfd, 0x7b, 0xc1, 0xa8, 0xc0, 0x03, 0x5f, 0xd6,
0x81, 0x46, 0x82, 0xd2, 0x00, 0x00, 0x01, 0x0b, 0xc0, 0x03, 0x5f, 0xd6,
];
assert_eq!(code, &golden[..]);
@@ -277,8 +273,6 @@ mod test {
.unwrap();
let code = &result.buffer.data[..];
// stp x29, x30, [sp, #-16]!
// mov x29, sp
// mov x1, #0x1234 // #4660
// add w0, w0, w1
// mov w1, w0
@@ -291,13 +285,11 @@ mod test {
// cbnz x1, 0x18
// mov x1, #0x1234 // #4660
// sub w0, w0, w1
// ldp x29, x30, [sp], #16
// ret
let golden = vec![
253, 123, 191, 169, 253, 3, 0, 145, 129, 70, 130, 210, 0, 0, 1, 11, 225, 3, 0, 42, 161,
0, 0, 181, 129, 70, 130, 210, 1, 0, 1, 11, 225, 3, 1, 42, 161, 255, 255, 181, 225, 3,
0, 42, 97, 255, 255, 181, 129, 70, 130, 210, 0, 0, 1, 75, 253, 123, 193, 168, 192, 3,
95, 214,
129, 70, 130, 210, 0, 0, 1, 11, 225, 3, 0, 42, 161, 0, 0, 181, 129, 70, 130, 210, 1, 0,
1, 11, 225, 3, 1, 42, 161, 255, 255, 181, 225, 3, 0, 42, 97, 255, 255, 181, 129, 70,
130, 210, 0, 0, 1, 75, 192, 3, 95, 214,
];
assert_eq!(code, &golden[..]);