selftests/powerpc/64: Test all paths through copy routines
The hand-coded assembler 64-bit copy routines include feature sections
that select one code path or another depending on which CPU we are
executing on. The self-tests for these copy routines end up testing
just one path. This adds a mechanism for selecting any desired code
path at compile time, and makes 2 or 3 versions of each test, each
using a different code path, so as to cover all the possible paths.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
[mpe: Add -mcpu=power4 to CFLAGS for older compilers]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/lib/memcpy_power7.S b/arch/powerpc/lib/memcpy_power7.S
index 070cdf6..89bfefc 100644
--- a/arch/powerpc/lib/memcpy_power7.S
+++ b/arch/powerpc/lib/memcpy_power7.S
@@ -19,7 +19,10 @@
*/
#include <asm/ppc_asm.h>
-_GLOBAL(memcpy_power7)
+#ifndef SELFTEST_CASE
+/* 0 == don't use VMX, 1 == use VMX */
+#define SELFTEST_CASE 0
+#endif
#ifdef __BIG_ENDIAN__
#define LVS(VRT,RA,RB) lvsl VRT,RA,RB
@@ -29,20 +32,17 @@
#define VPERM(VRT,VRA,VRB,VRC) vperm VRT,VRB,VRA,VRC
#endif
-#ifdef CONFIG_ALTIVEC
+_GLOBAL(memcpy_power7)
cmpldi r5,16
cmpldi cr1,r5,4096
-
std r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
-
blt .Lshort_copy
- bgt cr1,.Lvmx_copy
-#else
- cmpldi r5,16
- std r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
-
- blt .Lshort_copy
+#ifdef CONFIG_ALTIVEC
+test_feature = SELFTEST_CASE
+BEGIN_FTR_SECTION
+ bgt cr1, .Lvmx_copy
+END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
.Lnonvmx_copy:
@@ -223,8 +223,8 @@
addi r1,r1,STACKFRAMESIZE
b .Lnonvmx_copy
-#ifdef CONFIG_ALTIVEC
.Lvmx_copy:
+#ifdef CONFIG_ALTIVEC
mflr r0
std r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
std r5,-STACKFRAMESIZE+STK_REG(R29)(r1)