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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115026] New: msp430-elf fails
 gcc.dg/pr66444.c with prange enabled
Date: Fri, 10 May 2024 09:42:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115026

            Bug ID: 115026
           Summary: msp430-elf fails gcc.dg/pr66444.c with prange enabled
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aldyh at gcc dot gnu.org
  Target Milestone: ---

This is a separate issue reported by Jeff in PR115009.  I have reproduced o=
n a
cross compiler.

Copied below is his report:

And on msp430-elf we're getting a codegen correctness issue on msp430-elf.=
=20
gcc.dg/pr66444.c fails in the simulator.  The -O2 code difference looks lik=
e:

*** good.s      Thu May  9 20:41:37 2024
--- bad.s       Thu May  9 20:41:44 2024
*************** baz:
*** 73,81 ****
  ; saved regs:(none)
        ; start of prologue
        ; end of prologue
!       MOV.W   #2062, R12
        CALL    #fn1
!       MOV.W   #2062, R12
        CALL    #fn2
        MOV.B   #0, R12
        ; start of epilogue
--- 73,81 ----
  ; saved regs:(none)
        ; start of prologue
        ; end of prologue
!       MOV.B   #0, R12
        CALL    #fn1
!       MOV.B   #0, R12
        CALL    #fn2
        MOV.B   #0, R12
        ; start of epilogue


We're mucking up the pointer that baz() passes down to fn1 and fn2 I think.=