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Subject: [Bug bootstrap/44970] [4.6 regression] Revision 162270 failed to bootstrap
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From: "dave at hiauly1 dot hia dot nrc dot ca" <gcc-bugzilla@gcc.gnu.org>
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------- Comment #26 from dave at hiauly1 dot hia dot nrc dot ca  2010-07-18 20:43 -------
Subject: Re:  [4.6 regression] Revision 162270 failed to bootstrap

Doing a non bootstrap build, I see the following new fail:
FAIL: gcc.c-torture/execute/950605-1.c execution,  -O1

f:
        .PROC
        .CALLINFO FRAME=128,CALLS,SAVE_RP,ENTRY_GR=3
        .ENTRY
        std %r2,-16(%r30)
        ldi 255,%r28
        cmpb,= %r28,%r26,L$0003


The least significant byte of the argument passed in register %r26
is no longer extracted, causing compare to fail.  The is what I see
with gcc-4.4:

f:
        .PROC
        .CALLINFO FRAME=128,CALLS,SAVE_RP,ENTRY_GR=3
        .ENTRY
        std %r2,-16(%r30)
        extrd,u %r26,63,8,%r26
        ldi 255,%r28
        cmpb,= %r28,%r26,L$0004

Dave


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970