From: Andreas Schwab Date: Mon, 18 Apr 2011 02:03:53 +0000 (-0400) Subject: Fix POWER4/POWER7 optimized strncmp to not read past differing bytes X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91f0a13b84a8a4ff14219ea2691a6fa684902856;p=thirdparty%2Fglibc.git Fix POWER4/POWER7 optimized strncmp to not read past differing bytes --- diff --git a/ChangeLog b/ChangeLog index 9febaec114d..5119976d9e5 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2011-03-28 Andreas Schwab + + * sysdeps/powerpc/powerpc32/power4/strncmp.S: Don't read past + differing bytes. + * sysdeps/powerpc/powerpc64/power4/strncmp.S: Likewise. + * sysdeps/powerpc/powerpc32/power7/strncmp.S: Likewise. + * sysdeps/powerpc/powerpc64/power7/strncmp.S: Likewise. + 2011-07-28 Will Schmidt * sysdeps/powerpc/powerpc32/power7/memcpy.S: Optimize the diff --git a/sysdeps/powerpc/powerpc32/power4/strncmp.S b/sysdeps/powerpc/powerpc32/power4/strncmp.S index fc0835ebe0f..f5d47af1eb4 100644 --- a/sysdeps/powerpc/powerpc32/power4/strncmp.S +++ b/sysdeps/powerpc/powerpc32/power4/strncmp.S @@ -1,5 +1,5 @@ /* Optimized strcmp implementation for PowerPC32. - Copyright (C) 2003, 2006 Free Software Foundation, Inc. + Copyright (C) 2003, 2006, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -139,30 +139,31 @@ L(u1): bdz L(u4) cmpw rWORD1, rWORD2 beq- cr1, L(u4) + bne- L(u4) lbzu rWORD3, 1(rSTR1) lbzu rWORD4, 1(rSTR2) - bne- L(u4) cmpwi cr1, rWORD3, 0 bdz L(u3) cmpw rWORD3, rWORD4 beq- cr1, L(u3) + bne- L(u3) lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) - bne- L(u3) cmpwi cr1, rWORD1, 0 bdz L(u4) cmpw rWORD1, rWORD2 beq- cr1, L(u4) + bne- L(u4) lbzu rWORD3, 1(rSTR1) lbzu rWORD4, 1(rSTR2) - bne- L(u4) cmpwi cr1, rWORD3, 0 bdz L(u3) cmpw rWORD3, rWORD4 beq- cr1, L(u3) + bne- L(u3) lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) - beq+ L(u1) + b L(u1) L(u3): sub rRTN, rWORD3, rWORD4 blr diff --git a/sysdeps/powerpc/powerpc32/power7/strncmp.S b/sysdeps/powerpc/powerpc32/power7/strncmp.S index 61b33c3c36d..db466f07938 100644 --- a/sysdeps/powerpc/powerpc32/power7/strncmp.S +++ b/sysdeps/powerpc/powerpc32/power7/strncmp.S @@ -1,5 +1,5 @@ /* Optimized strcmp implementation for POWER7/PowerPC32. - Copyright (C) 2010 Free Software Foundation, Inc. + Copyright (C) 2010, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -143,30 +143,31 @@ L(u1): bdz L(u4) cmpw rWORD1,rWORD2 beq cr1,L(u4) + bne L(u4) lbzu rWORD3,1(rSTR1) lbzu rWORD4,1(rSTR2) - bne L(u4) cmpwi cr1,rWORD3,0 bdz L(u3) cmpw rWORD3,rWORD4 beq cr1,L(u3) + bne L(u3) lbzu rWORD1,1(rSTR1) lbzu rWORD2,1(rSTR2) - bne L(u3) cmpwi cr1,rWORD1,0 bdz L(u4) cmpw rWORD1,rWORD2 beq cr1,L(u4) + bne L(u4) lbzu rWORD3,1(rSTR1) lbzu rWORD4,1(rSTR2) - bne L(u4) cmpwi cr1,rWORD3,0 bdz L(u3) cmpw rWORD3,rWORD4 beq cr1,L(u3) + bne L(u3) lbzu rWORD1,1(rSTR1) lbzu rWORD2,1(rSTR2) - beq L(u1) + b L(u1) L(u3): sub rRTN,rWORD3,rWORD4 blr diff --git a/sysdeps/powerpc/powerpc64/power4/strncmp.S b/sysdeps/powerpc/powerpc64/power4/strncmp.S index 7a1665d2bc3..94ae85b9e4a 100644 --- a/sysdeps/powerpc/powerpc64/power4/strncmp.S +++ b/sysdeps/powerpc/powerpc64/power4/strncmp.S @@ -1,5 +1,5 @@ /* Optimized strcmp implementation for PowerPC64. - Copyright (C) 2003, 2006 Free Software Foundation, Inc. + Copyright (C) 2003, 2006, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -143,30 +143,31 @@ L(u1): bdz L(u4) cmpd rWORD1, rWORD2 beq- cr1, L(u4) + bne- L(u4) lbzu rWORD3, 1(rSTR1) lbzu rWORD4, 1(rSTR2) - bne- L(u4) cmpdi cr1, rWORD3, 0 bdz L(u3) cmpd rWORD3, rWORD4 beq- cr1, L(u3) + bne- L(u3) lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) - bne- L(u3) cmpdi cr1, rWORD1, 0 bdz L(u4) cmpd rWORD1, rWORD2 beq- cr1, L(u4) + bne- L(u4) lbzu rWORD3, 1(rSTR1) lbzu rWORD4, 1(rSTR2) - bne- L(u4) cmpdi cr1, rWORD3, 0 bdz L(u3) cmpd rWORD3, rWORD4 beq- cr1, L(u3) + bne- L(u3) lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) - beq+ L(u1) + b L(u1) L(u3): sub rRTN, rWORD3, rWORD4 blr diff --git a/sysdeps/powerpc/powerpc64/power7/strncmp.S b/sysdeps/powerpc/powerpc64/power7/strncmp.S index bba44455c32..eace179a6c4 100644 --- a/sysdeps/powerpc/powerpc64/power7/strncmp.S +++ b/sysdeps/powerpc/powerpc64/power7/strncmp.S @@ -1,5 +1,5 @@ /* Optimized strcmp implementation for POWER7/PowerPC64. - Copyright (C) 2010 Free Software Foundation, Inc. + Copyright (C) 2010, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -147,30 +147,31 @@ L(u1): bdz L(u4) cmpd rWORD1,rWORD2 beq cr1,L(u4) + bne L(u4) lbzu rWORD3,1(rSTR1) lbzu rWORD4,1(rSTR2) - bne L(u4) cmpdi cr1,rWORD3,0 bdz L(u3) cmpd rWORD3,rWORD4 beq cr1,L(u3) + bne L(u3) lbzu rWORD1,1(rSTR1) lbzu rWORD2,1(rSTR2) - bne L(u3) cmpdi cr1,rWORD1,0 bdz L(u4) cmpd rWORD1,rWORD2 beq cr1,L(u4) + bne L(u4) lbzu rWORD3,1(rSTR1) lbzu rWORD4,1(rSTR2) - bne L(u4) cmpdi cr1,rWORD3,0 bdz L(u3) cmpd rWORD3,rWORD4 beq cr1,L(u3) + bne L(u3) lbzu rWORD1,1(rSTR1) lbzu rWORD2,1(rSTR2) - beq L(u1) + b L(u1) L(u3): sub rRTN,rWORD3,rWORD4 blr