[llvm-bugs] [Bug 31546] New: umaal instruction generated for Cortex-M3

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31546

            Bug ID: 31546
           Summary: umaal instruction generated for Cortex-M3
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mpj at rowley.co.uk
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17806
  --> https://llvm.org/bugs/attachment.cgi?id=17806&action=edit
source code

Source Code Attached

Command line

e:\llvm-3.9.1\bin\clang.exe -c -target arm-none-eabi -mcpu=cortex-m3 umaal.cpp
-O1

Disassembly

        .section        .text,"ax",%progbits
        .global _Stl_mult64(unsigned long long, unsigned long long, unsigned
long long&, unsigned long long&)
        .thumb_func
_Stl_mult64(unsigned long long, unsigned long long, unsigned long long&,
unsigned long long&):
        push {r4-r6, lr}
        umull r12, lr, r2, r0
        mov r5, #0
        ldr r4, [sp, #20]
        umlal lr, r5, r2, r1
        umull r0, r2, r3, r0
        add.w r6, lr, r0
        adds.w r0, r0, lr
        adc r0, r2, #0
        umaal r5, r0, r3, r1
        ldr r1, [sp, #16]
        strd r12, r6, [r4, #0]
        strd r5, r0, [r1, #0]
        pop {r4-r6, pc}

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