https://llvm.org/bugs/show_bug.cgi?id=25818
Bug ID: 25818
Summary: ARM backend emitting vfp/neon instructions while
features disabled
Product: libraries
Version: 3.6
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
Assignee: unassignedb...@nondot.org
Reporter: l...@shortepic.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Compiling with rustc-nightly (81ae8be71 2015-12-09), and the following target
definition containing (selected):
"arch": "arm",
"cpu": "cortex-a8",
"fpu": "none",
"data-layout":
"e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64",
"disable-redzone": true,
"executables": true,
"llvm-target": "arm-none-eabi",
"os": "none",
"target-endian": "little",
"target-word-size": "32",
"target-pointer-width": "32",
"no-compiler-rt" : true,
"has-floating-point" : false,
"features" : "-fp16,-d16,-vfp2,-vfp3,-vfp4,-neon,-fp-only-sp",
rustc is emitting v* instructions:
106c0: edd00b00 vldr d16, [r0]
106c4: ed4b0b08 vstr d16, [fp, #-32] ; 0xffffffe0
106c8: edd00b02 vldr d16, [r0, #8]
106cc: ed4b0b0a vstr d16, [fp, #-40] ; 0xffffffd8
106d0: e5900010 ldr r0, [r0, #16]
106d4: e50b002c str r0, [fp, #-44] ; 0x2c
106d8: ed5b0b08 vldr d16, [fp, #-32] ; 0xffffffe0
106dc: edcd0b0a vstr d16, [sp, #40] ; 0x28
I'd like to suppress those when generating kernel code and I understand
negating features to be the basis for doing that. Can a maintainer please give
me a sense whether this is intended behaviour?
(So sorry I don't have the skills to isolate this closer to llvm..)
Regards, Alister.
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