https://bugs.llvm.org/show_bug.cgi?id=45123
Bug ID: 45123
Summary: Instruction for non-existing register is generated
when cross-compiling for arm1176jzf-s (raspberry pi
zero)
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: b...@jobo.tv
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Example test can be seen here: https://godbolt.org/z/nrkawW
int main()
{
long long a = 1234567890;
auto d = static_cast<double>(a);
return(d);
}
/*
-target arm-linux-gnueabihf
-march=armv6
-mfpu=vfpv2
-mcpu=arm1176jzf-s
-mtune=arm1176jzf-s
-mfloat-abi=hard
*/
when cross-compiled with clang-9 instruction for non-existing register d16 is
generated:
...
vmov d16, r0, r1
vstr d16, [sp]
vldr d16, [sp]
...
when cross-compiled with clang-8 or less register d0 (existing is used)
...
vmov d0, r0, r1
vstr d0, [sp]
vldr d0, [sp]
...
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