powerpc: Fix build failures with current GCC

Since GCC commit 271500 (svn), also known as the following commit on the
git mirror:

commit 61edec870f9fdfb5df3fa4e40f28cbaede28a5b1
Author: amodra <amodra@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed May 22 04:34:26 2019 +0000

    [RS6000] Don't pass -many to the assembler

glibc builds are failing when an assembly implementation does not
declare the correct '.machine' directive, or when no such directive is
declared at all.  For example, when a POWER6 instruction is used, but
'.machine power6' is not declared, the assembler will fail with an error
similar to the following:

    ../sysdeps/powerpc/powerpc64/power8/strcmp.S: Assembler messages:
     24 ../sysdeps/powerpc/powerpc64/power8/strcmp.S:55: Error: unrecognized opcode: `cmpb'

This patch adds '.machine powerN' directives where none existed, as well
as it updates '.machine power7' directives on POWER8 files, because the
minimum binutils version required to build glibc (binutils 2.25) now
provides this machine version.  It also adds '-many' to the assembler
command used to build tst-set_ppr.c.

Tested for powerpc, powerpc64, and powerpc64le, as well as with
build-many-glibcs.py for powerpc targets.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

ChangeLog

@@ -1,3 +1,23 @@
+2019-05-30  Gabriel F. T. Gomes  <gabrielftg@linux.ibm.com>
+
+	* sysdeps/powerpc/Makefile
+	[$(subdir) == misc] (CFLAGS-tst-set_ppr.c): New variable.
+	* sysdeps/powerpc/powerpc64/power4/memcmp.S [__LITTLE_ENDIAN__]:
+	Declare '.machine power7' to get support for ldbrx.
+	* sysdeps/powerpc/powerpc64/power7/strncmp.S: Declare '.machine'
+	directive based on the directory of the file.
+	* sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S: Likewise.
+	* sysdeps/powerpc/powerpc64/power8/strcmp.S: Likewise.
+	* sysdeps/powerpc/powerpc64/power8/strcasecmp.S: Update
+	'.machine' directive.
+	(VCLZD_V8_v7, MFVRD_R3_V1, VSUBUDM_V9_V8, VPOPCNTD_V8_V8)
+	(VADDUQM_V7_V8): Remove.
+	(__STRCASECMP): Replace macros with actual instructions.
+	* sysdeps/powerpc/powerpc64/power8/strcasestr.S: Update
+	'.machine' directive.
+	(VCLZD_V8_v7): Remove.
+	(STRCASESTR): Replace VCLZD_V8_v7 with actual instruction.
+
 2019-05-29  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
 	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/get_clockfreq.c:

sysdeps/powerpc/Makefile

@@ -45,6 +45,11 @@ ifeq ($(subdir),misc)
 sysdep_headers += sys/platform/ppc.h
 tests += test-gettimebase
 tests += tst-set_ppr
+
+# This test is expected to run and exit with EXIT_UNSUPPORTED on
+# processors that do not implement the Power ISA 2.06 or greater.
+# But the test makes use of instructions from Power ISA 2.06 and 2.07.
+CFLAGS-tst-set_ppr.c += -Wa,-many
 endif
 
 ifeq ($(subdir),wcsmbs)

sysdeps/powerpc/powerpc64/power4/memcmp.S

@@ -26,7 +26,14 @@
 # define MEMCMP memcmp
 #endif
 
+#ifndef __LITTLE_ENDIAN__
 	.machine power4
+#else
+/* Little endian is only available since POWER8, so it's safe to
+   specify .machine as power8 (or older), even though this is a POWER4
+   file.  Since the little-endian code uses 'ldbrx', power7 is enough. */
+	.machine power7
+#endif
 ENTRY_TOCLESS (MEMCMP, 4)
 	CALL_MCOUNT 3
 

sysdeps/powerpc/powerpc64/power7/strncmp.S

@@ -28,6 +28,7 @@
 		     const char *s2 [r4],
 		     size_t size [r5])  */
 
+	.machine power7
 ENTRY_TOCLESS (STRNCMP, 5)
 	CALL_MCOUNT 3
 

sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S

@@ -26,6 +26,7 @@
 
 /* long long [r3] llround (float x [fp1])  */
 
+	.machine power8
 ENTRY_TOCLESS (__llround)
 	CALL_MCOUNT 0
 	frin	fp1,fp1	/* Round to nearest +-0.5.  */

sysdeps/powerpc/powerpc64/power8/strcasecmp.S

@@ -91,21 +91,7 @@
 3: \
 	TOLOWER()
 
-#ifdef _ARCH_PWR8
+	.machine  power8
-#  define VCLZD_V8_v7	vclzd	v8, v7;
-#  define MFVRD_R3_V1	mfvrd	r3, v1;
-#  define VSUBUDM_V9_V8	vsubudm	v9, v9, v8;
-#  define VPOPCNTD_V8_V8	vpopcntd v8, v8;
-#  define VADDUQM_V7_V8	vadduqm	v9, v7, v8;
-#else
-#  define VCLZD_V8_v7	.long	0x11003fc2
-#  define MFVRD_R3_V1	.long	0x7c230067
-#  define VSUBUDM_V9_V8	.long	0x112944c0
-#  define VPOPCNTD_V8_V8	.long	0x110047c3
-#  define VADDUQM_V7_V8	.long	0x11274100
-#endif
-
-	.machine  power7
 
 ENTRY (__STRCASECMP)
 #ifdef USE_AS_STRNCASECMP
@@ -265,15 +251,15 @@ L(different):
 #ifdef __LITTLE_ENDIAN__
 	/* Count trailing zero.  */
 	vspltisb	v8, -1
-	VADDUQM_V7_V8
+	vadduqm	v9, v7, v8
 	vandc	v8, v9, v7
-	VPOPCNTD_V8_V8
+	vpopcntd	v8, v8
 	vspltb	v6, v8, 15
 	vcmpequb.	v6, v6, v1
 	blt	cr6, L(shift8)
 #else
 	/* Count leading zero.  */
-	VCLZD_V8_v7
+	vclzd	v8, v7
 	vspltb	v6, v8, 7
 	vcmpequb.	v6, v6, v1
 	blt	cr6, L(shift8)
@@ -291,7 +277,7 @@ L(skipsum):
 	/* Merge and move to GPR.  */
 	vmrglb	v6, v6, v7
 	vslo	v1, v6, v1
-	MFVRD_R3_V1
+	mfvrd	r3, v1
 	/* Place the characters that are different in first position.  */
 	sldi	rSTR2, rRTN, 56
 	srdi	rSTR2, rSTR2, 56
@@ -301,7 +287,7 @@ L(skipsum):
 	vslo	v6, v5, v8
 	vslo	v7, v4, v8
 	vmrghb	v1, v6, v7
-	MFVRD_R3_V1
+	mfvrd	r3, v1
 	srdi	rSTR2, rRTN, 48
 	sldi	rSTR2, rSTR2, 56
 	srdi	rSTR2, rSTR2, 56
@@ -320,15 +306,15 @@ L(null_found):
 #ifdef __LITTLE_ENDIAN__
 	/* Count trailing zero.  */
 	vspltisb	v8, -1
-	VADDUQM_V7_V8
+	vadduqm	v9, v7, v8
 	vandc	v8, v9, v7
-	VPOPCNTD_V8_V8
+	vpopcntd	v8, v8
 	vspltb	v6, v8, 15
 	vcmpequb.	v6, v6, v10
 	blt	cr6, L(shift_8)
 #else
 	/* Count leading zero.  */
-	VCLZD_V8_v7
+	vclzd	v8, v7
 	vspltb	v6, v8, 7
 	vcmpequb.	v6, v6, v10
 	blt	cr6, L(shift_8)
@@ -343,10 +329,10 @@ L(skipsum1):
 	vspltisb	v10, 7
 	vslb	v10, v10, v10
 	vsldoi	v9, v0, v10, 1
-	VSUBUDM_V9_V8
+	vsubudm	v9, v9, v8
 	vspltisb	v8, 8
 	vsldoi	v8, v0, v8, 1
-	VSUBUDM_V9_V8
+	vsubudm	v9, v9, v8
 	/* Shift and remove junk after null character.  */
 #ifdef __LITTLE_ENDIAN__
 	vslo	v5, v5, v9

sysdeps/powerpc/powerpc64/power8/strcasestr.S

@@ -73,18 +73,8 @@
 	vor	reg, v8, reg; \
 	vcmpequb.	v6, reg, v4;
 
-/* TODO: change these to the actual instructions when the minimum required
-   binutils allows it.  */
-#ifdef _ARCH_PWR8
-#define VCLZD_V8_v7	vclzd	v8, v7;
-#else
-#define VCLZD_V8_v7	.long	0x11003fc2
-#endif
-
 #define	FRAMESIZE	(FRAME_MIN_SIZE+48)
-/* TODO: change this to .machine power8 when the minimum required binutils
+	.machine  power8
-   allows it.  */
-	.machine  power7
 ENTRY (STRCASESTR, 4)
 	CALL_MCOUNT 2
 	mflr	r0			/* Load link register LR to r0.  */
@@ -291,7 +281,7 @@ L(nullchk1):
 	vcmpequb.	v6, v0, v7
 	/* Shift r3 by 16 bytes and proceed.  */
 	blt	cr6, L(shift16)
-	VCLZD_V8_v7
+	vclzd	v8, v7
 #ifdef __LITTLE_ENDIAN__
 	vspltb	v6, v8, 15
 #else

sysdeps/powerpc/powerpc64/power8/strcmp.S

@@ -31,6 +31,7 @@
    64K as default, the page cross handling assumes minimum page size of
    4k.  */
 
+	.machine power8
 ENTRY_TOCLESS (STRCMP, 4)
 	li	r0,0