[llvm-bugs] [Bug 31720] New: [ARM] LLVM allows {LD, ST}REX{B, H, D} on Thumb1 targets

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31720

            Bug ID: 31720
           Summary: [ARM] LLVM allows {LD,ST}REX{B,H,D} on Thumb1 targets
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: renato.golin at linaro.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17878
  --> https://llvm.org/bugs/attachment.cgi?id=17878&action=edit
Script that reproduced the lack of error messages

The attached Perl script tests a matrix of arch/isa support for all exclusive
load/store operations, and it seems LLVM allows pre-v6T2 arches to emit Thumb2
code.

This is the script's output:

LLVM passes with: echo 'ldrexd r2, r3, [r4]' | llvm-mc -triple armv4 -o
/dev/null
LLVM passes with: echo 'strexd r0, r2, r3, [r4]' | llvm-mc -triple armv4 -o
/dev/null
LLVM passes with: echo 'ldrexd r2, r3, [r4]' | llvm-mc -triple armv5 -o
/dev/null
LLVM passes with: echo 'strexd r0, r2, r3, [r4]' | llvm-mc -triple armv5 -o
/dev/null
LLVM passes with: echo 'ldrexd r2, r3, [r4]' | llvm-mc -triple armv6 -o
/dev/null
LLVM passes with: echo 'strexd r0, r2, r3, [r4]' | llvm-mc -triple armv6 -o
/dev/null
LLVM passes with: echo 'ldrexd r2, r3, [r4]' | llvm-mc -triple armv6t2 -o
/dev/null
LLVM passes with: echo 'strexd r0, r2, r3, [r4]' | llvm-mc -triple armv6t2 -o
/dev/null
LLVM passes with: echo 'ldrex r3, [r4]' | llvm-mc -triple armv4 -o /dev/null
LLVM passes with: echo 'strex r2, r3, [r4]' | llvm-mc -triple armv4 -o
/dev/null
LLVM passes with: echo 'ldrex r3, [r4]' | llvm-mc -triple armv5 -o /dev/null
LLVM passes with: echo 'strex r2, r3, [r4]' | llvm-mc -triple armv5 -o
/dev/null
LLVM passes with: echo 'ldrexb r3, [r4]' | llvm-mc -triple armv4 -o /dev/null
LLVM passes with: echo 'strexb r2, r3, [r4]' | llvm-mc -triple armv4 -o
/dev/null
LLVM passes with: echo 'ldrexb r3, [r4]' | llvm-mc -triple armv5 -o /dev/null
LLVM passes with: echo 'strexb r2, r3, [r4]' | llvm-mc -triple armv5 -o
/dev/null
LLVM passes with: echo 'ldrexb r3, [r4]' | llvm-mc -triple armv6 -o /dev/null
LLVM passes with: echo 'strexb r2, r3, [r4]' | llvm-mc -triple armv6 -o
/dev/null
LLVM passes with: echo 'ldrexb r3, [r4]' | llvm-mc -triple armv6t2 -o /dev/null
LLVM passes with: echo 'strexb r2, r3, [r4]' | llvm-mc -triple armv6t2 -o
/dev/null
LLVM passes with: echo 'ldrexh r3, [r4]' | llvm-mc -triple armv4 -o /dev/null
LLVM passes with: echo 'strexh r2, r3, [r4]' | llvm-mc -triple armv4 -o
/dev/null
LLVM passes with: echo 'ldrexh r3, [r4]' | llvm-mc -triple armv5 -o /dev/null
LLVM passes with: echo 'strexh r2, r3, [r4]' | llvm-mc -triple armv5 -o
/dev/null
LLVM passes with: echo 'ldrexh r3, [r4]' | llvm-mc -triple armv6 -o /dev/null
LLVM passes with: echo 'strexh r2, r3, [r4]' | llvm-mc -triple armv6 -o
/dev/null
LLVM passes with: echo 'ldrexh r3, [r4]' | llvm-mc -triple armv6t2 -o /dev/null
LLVM passes with: echo 'strexh r2, r3, [r4]' | llvm-mc -triple armv6t2 -o
/dev/null
Number of tests: 128
   GCC failures: 0
  LLVM failures: 28

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