https://sourceware.org/bugzilla/show_bug.cgi?id=25274
Bug ID: 25274
Summary: Error: can't encode register '%r12' in an instruction
requiring REX prefix
Product: binutils
Version: 2.34 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-cfl-1 tmp]$ cat a.s
testq $63,%r11
testq $63,%r12
[hjl@gnu-cfl-1 tmp]$ as -Os -o a.o a.s
a.s: Assembler messages:
a.s:2: Error: can't encode register '%r12' in an instruction requiring REX
prefix.
[hjl@gnu-cfl-1 tmp]$
Similar to SP, BP, SI and DI registers, R12-R15 registers must be updated
to R12b-R15b when optimizing
test $imm7, %r64/%r32/%r16 -> test $imm7, %r8
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