[patch 16/24] Immediate Values - Powerpc Optimization
PowerPC optimization of the immediate values which uses a li instruction,
patched with an immediate value.
Changelog:
- Put imv_set and _imv_set in the architecture independent header.
- Pack the __imv section. Use smallest types required for size (char).
- Remove architecture specific update code : now handled by architecture
agnostic code.
- Use imv_* instead of immediate_*.
Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
CC: Rusty Russell <[EMAIL PROTECTED]>
CC: Christoph Hellwig <[EMAIL PROTECTED]>
CC: Paul Mackerras <[EMAIL PROTECTED]>
---
arch/powerpc/Kconfig|1
include/asm-powerpc/immediate.h | 55
2 files changed, 56 insertions(+)
Index: linux-2.6-lttng/include/asm-powerpc/immediate.h
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ linux-2.6-lttng/include/asm-powerpc/immediate.h 2007-11-19
12:26:16.0 -0500
@@ -0,0 +1,55 @@
+#ifndef _ASM_POWERPC_IMMEDIATE_H
+#define _ASM_POWERPC_IMMEDIATE_H
+
+/*
+ * Immediate values. PowerPC architecture optimizations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <[EMAIL PROTECTED]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include
+
+/**
+ * imv_read - read immediate variable
+ * @name: immediate value name
+ *
+ * Reads the value of @name.
+ * Optimized version of the immediate.
+ * Do not use in __init and __exit functions. Use _imv_read() instead.
+ */
+#define imv_read(name) \
+ ({ \
+ __typeof__(name##__imv) value; \
+ BUILD_BUG_ON(sizeof(value) > 8);\
+ switch (sizeof(value)) {\
+ case 1: \
+ asm(".section __imv,\"a\",@progbits\n\t"\
+ PPC_LONG "%c1, ((1f)-1)\n\t"\
+ ".byte 1\n\t" \
+ ".previous\n\t" \
+ "li %0,0\n\t" \
+ "1:\n\t"\
+ : "=r" (value) \
+ : "i" (##__imv)); \
+ break; \
+ case 2: \
+ asm(".section __imv,\"a\",@progbits\n\t"\
+ PPC_LONG "%c1, ((1f)-2)\n\t"\
+ ".byte 2\n\t" \
+ ".previous\n\t" \
+ "li %0,0\n\t" \
+ "1:\n\t"\
+ : "=r" (value) \
+ : "i" (##__imv)); \
+ break; \
+ case 4: \
+ case 8: value = name##__imv;\
+ break; \
+ }; \
+ value; \
+ })
+
+#endif /* _ASM_POWERPC_IMMEDIATE_H */
Index: linux-2.6-lttng/arch/powerpc/Kconfig
===
--- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2007-11-19 12:25:21.0
-0500
+++ linux-2.6-lttng/arch/powerpc/Kconfig2007-11-19 12:26:01.0
-0500
@@ -81,6 +81,7 @@ config PPC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_IMMEDIATE
config EARLY_PRINTK
bool
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
--
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Please read the FAQ at http://www.tux.org/lkml/
[patch 16/24] Immediate Values - Powerpc Optimization
PowerPC optimization of the immediate values which uses a li instruction,
patched with an immediate value.
Changelog:
- Put imv_set and _imv_set in the architecture independent header.
- Pack the __imv section. Use smallest types required for size (char).
- Remove architecture specific update code : now handled by architecture
agnostic code.
- Use imv_* instead of immediate_*.
Signed-off-by: Mathieu Desnoyers [EMAIL PROTECTED]
CC: Rusty Russell [EMAIL PROTECTED]
CC: Christoph Hellwig [EMAIL PROTECTED]
CC: Paul Mackerras [EMAIL PROTECTED]
---
arch/powerpc/Kconfig|1
include/asm-powerpc/immediate.h | 55
2 files changed, 56 insertions(+)
Index: linux-2.6-lttng/include/asm-powerpc/immediate.h
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ linux-2.6-lttng/include/asm-powerpc/immediate.h 2007-11-19
12:26:16.0 -0500
@@ -0,0 +1,55 @@
+#ifndef _ASM_POWERPC_IMMEDIATE_H
+#define _ASM_POWERPC_IMMEDIATE_H
+
+/*
+ * Immediate values. PowerPC architecture optimizations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers [EMAIL PROTECTED]
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include asm/asm-compat.h
+
+/**
+ * imv_read - read immediate variable
+ * @name: immediate value name
+ *
+ * Reads the value of @name.
+ * Optimized version of the immediate.
+ * Do not use in __init and __exit functions. Use _imv_read() instead.
+ */
+#define imv_read(name) \
+ ({ \
+ __typeof__(name##__imv) value; \
+ BUILD_BUG_ON(sizeof(value) 8);\
+ switch (sizeof(value)) {\
+ case 1: \
+ asm(.section __imv,\a\,@progbits\n\t\
+ PPC_LONG %c1, ((1f)-1)\n\t\
+ .byte 1\n\t \
+ .previous\n\t \
+ li %0,0\n\t \
+ 1:\n\t\
+ : =r (value) \
+ : i (name##__imv)); \
+ break; \
+ case 2: \
+ asm(.section __imv,\a\,@progbits\n\t\
+ PPC_LONG %c1, ((1f)-2)\n\t\
+ .byte 2\n\t \
+ .previous\n\t \
+ li %0,0\n\t \
+ 1:\n\t\
+ : =r (value) \
+ : i (name##__imv)); \
+ break; \
+ case 4: \
+ case 8: value = name##__imv;\
+ break; \
+ }; \
+ value; \
+ })
+
+#endif /* _ASM_POWERPC_IMMEDIATE_H */
Index: linux-2.6-lttng/arch/powerpc/Kconfig
===
--- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2007-11-19 12:25:21.0
-0500
+++ linux-2.6-lttng/arch/powerpc/Kconfig2007-11-19 12:26:01.0
-0500
@@ -81,6 +81,7 @@ config PPC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_IMMEDIATE
config EARLY_PRINTK
bool
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
