[llvm-bugs] [Bug 37892] New: Assertion failed: IndexReg.getReg() != X86::ESP && IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!"

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https://bugs.llvm.org/show_bug.cgi?id=37892

            Bug ID: 37892
           Summary: Assertion failed: IndexReg.getReg() != X86::ESP &&
                    IndexReg.getReg() != X86::RSP && "Cannot use ESP as
                    index reg!"
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: greg.bedwell at sony.com
                CC: llvm-bugs at lists.llvm.org

Found with a tool we've been using to randomly permute x86 assembly for
llvm-mca testing.  In this case the assembly it's generated is invalid but the
compiler is asserting rather than erroring.

$ clang.exe --version
clang version 7.0.0 (trunk 335220) (llvm/trunk 335219)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: e:\work\upstream-llvm\build-vs2015-native-ninja\bin

$ cat 1.s
leaq (%rax,%rsp), %rax

$ gcc -c 1.s
1.s: Assembler messages:
1.s:1: Error: `(%rax,%rsp)' is not a valid base/index expression

$ clang.exe -c 1.s
Assertion failed: IndexReg.getReg() != X86::ESP && IndexReg.getReg() !=
X86::RSP && "Cannot use ESP as index reg!", file
E:\work\upstream-llvm\llvm\lib\Target\X86\MCTargetDesc\X86MCCodeEmitter.cpp,
line 561

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