http://llvm.org/bugs/show_bug.cgi?id=15573
Bug ID: 15573
Summary: x86_64: Result code use stack before %rsp (out of
stack frame)
Product: clang
Version: trunk
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10229
--> http://llvm.org/bugs/attachment.cgi?id=10229&action=edit
Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'
For function with complex vector operation, when need Spill/Reload registers.
Result x86_64 code (Spill/Reload out of frame):
...
movq %rsp, %rbp
Ltmp5:
.cfi_def_cfa_register %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $696, %rsp
...
movq %rdx, -856(%rbp)
...
movdqa %xmm4, -752(%rbp)
...
movq -856(%rbp), %rax
...
movdqa -752(%rbp), %xmm3
As result for programs with signals or interrupts, signal/interrupt handler
rewrite stack below %rsp.
Sorry, I can't reduce code. Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'
Affect clang x86_64: 3.0, 3.1, 3.2, 3.3 (trunk 173279) and Xcode 4.6.1 Apple
LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
$ uname -a
Darwin leom-3.local 12.3.0 Darwin Kernel Version 12.3.0: Sun Jan 6 22:37:10
PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64 x86_64
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