[llvm-bugs] [Bug 24308] assembler: suboptimal encoding of memory operand
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Mar 20 08:42:26 PDT 2018
https://bugs.llvm.org/show_bug.cgi?id=24308
Nirav Dave <niravd at google.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
CC| |niravd at google.com
--- Comment #1 from Nirav Dave <niravd at google.com> ---
This appears to have been caused by not fully folding the constant in the
address. Dumping to assembly results in
vpaddd 12(%rdi,%rax), %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xfe,0x44,0x07,0x0c]
vpaddd 12(%rdi,%rax), %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xfe,0x44,0x07,0x0c]
vpaddd 12(%rdi,%rax), %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xfe,0x44,0x07,0x0c]
vpaddd 16-4(%rdi,%rax), %xmm0, %xmm0 #
encoding:[0xc5,0xf9,0xfe,0x84,0x07,A,A,A,A]
# fixup A - offset: 5, value: 16-4,
kind: reloc_signed_4byte
This was fixed after the 5 release sometime.
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