[Bug 1881004] [NEW] fpu/softfloat.c: error: bitwise negation of a boolean expression

[Philippe Mathieu-Daudé]

Public bug reported:

Last time I built QEMU was on commit d5c75ec500d96f1d93447f990cd5a4ef5ba27fae,
I just pulled to fea8f3ed739536fca027cf56af7f5576f37ef9cd and now get:
 
  CC      lm32-softmmu/fpu/softfloat.o
fpu/softfloat.c:3365:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
    absZ &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            !
fpu/softfloat.c:3423:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
        absZ0 &= ~ ( ( (uint64_t) ( absZ1<<1 ) == 0 ) & roundNearestEven );
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 !
fpu/softfloat.c:3483:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
        absZ0 &= ~(((uint64_t)(absZ1<<1) == 0) & roundNearestEven);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 !
fpu/softfloat.c:3606:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
    zSig &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            !
fpu/softfloat.c:3760:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
    zSig &= ~ ( ( ( roundBits ^ 0x200 ) == 0 ) & roundNearestEven );
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            !
fpu/softfloat.c:3987:21: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
                    ~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven );
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    !
fpu/softfloat.c:4003:22: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
            zSig0 &= ~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven );
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                     !
fpu/softfloat.c:4273:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
        zSig1 &= ~ ( ( zSig2 + zSig2 == 0 ) & roundNearestEven );
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 !
8 errors generated.

$ clang -v
clang version 10.0.0-4ubuntu1 
Target: aarch64-unknown-linux-gnu

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04 LTS
Release:        20.04
Codename:       focal

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881004

Title:
  fpu/softfloat.c: error: bitwise negation of a boolean expression

Status in QEMU:
  New

Bug description:
  Last time I built QEMU was on commit d5c75ec500d96f1d93447f990cd5a4ef5ba27fae,
  I just pulled to fea8f3ed739536fca027cf56af7f5576f37ef9cd and now get:
   
    CC      lm32-softmmu/fpu/softfloat.o
  fpu/softfloat.c:3365:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
      absZ &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              !
  fpu/softfloat.c:3423:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
          absZ0 &= ~ ( ( (uint64_t) ( absZ1<<1 ) == 0 ) & roundNearestEven );
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                   !
  fpu/softfloat.c:3483:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
          absZ0 &= ~(((uint64_t)(absZ1<<1) == 0) & roundNearestEven);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                   !
  fpu/softfloat.c:3606:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
      zSig &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              !
  fpu/softfloat.c:3760:13: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
      zSig &= ~ ( ( ( roundBits ^ 0x200 ) == 0 ) & roundNearestEven );
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              !
  fpu/softfloat.c:3987:21: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
                      ~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven );
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                      !
  fpu/softfloat.c:4003:22: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
              zSig0 &= ~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven 
);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                       !
  fpu/softfloat.c:4273:18: error: bitwise negation of a boolean expression; did 
you mean logical negation? [-Werror,-Wbool-operation]
          zSig1 &= ~ ( ( zSig2 + zSig2 == 0 ) & roundNearestEven );
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                   !
  8 errors generated.

  $ clang -v
  clang version 10.0.0-4ubuntu1 
  Target: aarch64-unknown-linux-gnu

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04 LTS
  Release:        20.04
  Codename:       focal

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