negated shift size not sign-extending

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Article #2105

#2105

From: Ken Raeburn
Date: Sun, 01 Jan 1989 10:50

22 lines
707 bytes

using gcc 1.32 vax, -O -fstrength-reduce -fcombine-regs

    int foo (long number) {
	return number >>= 8;
    }

generates:

    #NO_APP
    gcc_compiled.:
    .text
	    .align 1
    .globl _foo
    _foo:
	    .word 0x0
	    ashl $248,4(ap),r0
	    ret

The 248 should probably be -8....

-- Ken

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Message-ID: <8901011050.AA02152@MULTICS.MIT.EDU>

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Path: arc1-ca.pugleaf.net!utzoo!telly!ddsw1!lll-winken!uunet!tut.cis.ohio-state.edu!ATHENA.MIT.EDU!raeburn
From: raeburn@ATHENA.MIT.EDU (Ken Raeburn)
Newsgroups: gnu.gcc.bug
Subject: negated shift size not sign-extending
Message-ID: <8901011050.AA02152@MULTICS.MIT.EDU>
Date: 1 Jan 89 10:50:17 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
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