[llvm-bugs] [Bug 31058] New: Integrated assembler rejects ldrexd/strexd in thumb mode

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Nov 18 08:54:50 PST 2016


            Bug ID: 31058
           Summary: Integrated assembler rejects ldrexd/strexd in thumb
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sbc at chromium.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

These instructions are apparently valid in thumb2 mode but clang's integrated
asm rejects them:

void func() {
  int volatile *ptr;
  int ret;
  __asm__ __volatile__("ldrexd %0,[%1]\n"
      : "=&r" (ret)
      : "r" (ptr)
      : "cc", "memory"

$ clang --target=arm-linux-gnueabihf -march=armv7-a -o test.o -c test.c 
test.c:4:24: error: instruction requires: arm-mode
  __asm__ __volatile__("ldrexd %0,[%1]\n"
<inline asm>:1:2: note: instantiated into assembly here
        ldrexd r1,[r0]
1 error generated.

With -no-integrated-as the same code compiles fine:

See https://bugs.chromium.org/p/chromium/issues/detail?id=564059

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