Always add the frame-pointer=all attribute #57209
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At some point LLVM on MacOS started doing frame pointer optimization by default. Ask for a frame pointer on every function, on all platforms.
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What's the user-facing consequence for this change? |
gbaraldi
approved these changes
Jan 30, 2025
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I don't see much difference on aarch64-linux on this PR: julia> versioninfo()
Julia Version 1.12.0-DEV.1955
Commit 5256457fc45 (2025-01-30 21:23 UTC)
Build Info:
Official https://julialang.org release
Platform Info:
OS: Linux (aarch64-linux-gnu)
CPU: 72 × unknown
WORD_SIZE: 64
LLVM: libLLVM-18.1.7 (ORCJIT, neoverse-v2)
GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 72 virtual cores)
julia> @code_native ((x,y) -> Core.Intrinsics.add_float(x,y))(1.0,2.0) .text
.file "#5"
.globl "julia_#5_2248" // -- Begin function julia_#5_2248
.p2align 4
.type "julia_#5_2248",@function
"julia_#5_2248": // @"julia_#5_2248"
; Function Signature: var"#5"(Float64, Float64)
; ┌ @ REPL[4]:1 within `#5`
// %bb.0: // %top
//DEBUG_VALUE: #5:x <- $d0
//DEBUG_VALUE: #5:x <- $d0
//DEBUG_VALUE: #5:y <- $d1
//DEBUG_VALUE: #5:y <- $d1
stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
mov x29, sp
fadd d0, d0, d1
ldp x29, x30, [sp], #16 // 16-byte Folded Reload
ret
.Lfunc_end0:
.size "julia_#5_2248", .Lfunc_end0-"julia_#5_2248"
; └
// -- End function
.type ".L+Core.Float64#2250",@object // @"+Core.Float64#2250"
.section .rodata,"a",@progbits
.p2align 3, 0x0
".L+Core.Float64#2250":
.xword ".L+Core.Float64#2250.jit"
.size ".L+Core.Float64#2250", 8
.set ".L+Core.Float64#2250.jit", 281472563526608
.size ".L+Core.Float64#2250.jit", 8
.section ".note.GNU-stack","",@progbits |
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Should affect macos only |
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I can't find official documentation on what the apple profiling tools expect, but apple clang on arm includes
If we don't add this attribute, the default varies by platform: CommonArgs.cpp:
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At some point LLVM on MacOS started doing frame pointer optimization by default. We should ask for a frame pointer on every function, on all platforms.
Prior to this change, on
1.11.3+0.aarch64.apple.darwin14:Prior to this change, on
1.11.3+0.aarch64.linux.gnu: