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Date: Thu, 8 Apr 2021 15:33:44 +0000 (UTC)
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 1/2] powerpc/bitops: Use immediate operand when possible
Today we get the following code generation for bitops like
set or clear bit:
c0009fe0: 39 40 08 00 li r10,2048
c0009fe4: 7c e0 40 28 lwarx r7,0,r8
c0009fe8: 7c e7 53 78 or r7,r7,r10
c0009fec: 7c e0 41 2d stwcx. r7,0,r8
c000c044: 39 40 20 00 li r10,8192
c000c048: 7c e0 40 28 lwarx r7,0,r8
c000c04c: 7c e7 50 78 andc r7,r7,r10
c000c050: 7c e0 41 2d stwcx. r7,0,r8
Most set bits are constant on lower 16 bits, so it can easily
be replaced by the "immediate" version of the operation. Allow
GCC to choose between the normal or immediate form.
For clear bits, on 32 bits 'rlwinm' can be used instead or 'andc' for
when all bits to be cleared are consecutive. For the time being only
handle the single bit case, which we detect by checking whether the
mask is a power of two. Can't use is_power_of_2() function because it
is not included yet, but it is easy to code with (mask & (mask - 1))
and even the 0 case which is not a power of two is acceptable for us.
On 64 bits we don't have any equivalent single operation, we'd need
two 'rldicl' so it is not worth it.
With this patch we get:
c0009fe0: 7d 00 50 28 lwarx r8,0,r10
c0009fe4: 61 08 08 00 ori r8,r8,2048
c0009fe8: 7d 00 51 2d stwcx. r8,0,r10
c000c034: 7d 00 50 28 lwarx r8,0,r10
c000c038: 55 08 04 e2 rlwinm r8,r8,0,19,17
c000c03c: 7d 00 51 2d stwcx. r8,0,r10
On pmac32_defconfig, it reduces the text by approx 10 kbytes.
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
arch/powerpc/include/asm/bitops.h | 77 +++++++++++++++++++++++++++----
1 file changed, 69 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/include/asm/bitops.h b/arch/powerpc/include/asm/bitops.h
index 299ab33505a6..0b0c6bdd9be9 100644
--- a/arch/powerpc/include/asm/bitops.h
+++ b/arch/powerpc/include/asm/bitops.h
@@ -71,19 +71,49 @@ static inline void fn(unsigned long mask, \
__asm__ __volatile__ ( \
prefix \
"1:" PPC_LLARX(%0,0,%3,0) "\n" \
- stringify_in_c(op) "%0,%0,%2\n" \
+ #op "%I2 %0,%0,%2\n" \
PPC_STLCX "%0,0,%3\n" \
"bne- 1b\n" \
: "=&r" (old), "+m" (*p) \
- : "r" (mask), "r" (p) \
+ : "rK" (mask), "r" (p) \
: "cc", "memory"); \
}
DEFINE_BITOP(set_bits, or, "")
-DEFINE_BITOP(clear_bits, andc, "")
-DEFINE_BITOP(clear_bits_unlock, andc, PPC_RELEASE_BARRIER)
DEFINE_BITOP(change_bits, xor, "")
+#define DEFINE_CLROP(fn, prefix) \
+static inline void fn(unsigned long mask, volatile unsigned long *_p) \
+{ \
+ unsigned long old; \
+ unsigned long *p = (unsigned long *)_p; \
+ if (IS_ENABLED(CONFIG_PPC32) && \
+ __builtin_constant_p(mask) && !(mask & (mask - 1))) { \
+ asm volatile ( \
+ prefix \
+ "1:" "lwarx %0,0,%3\n" \
+ "rlwinm %0,%0,0,%2\n" \
+ "stwcx. %0,0,%3\n" \
+ "bne- 1b\n" \
+ : "=&r" (old), "+m" (*p) \
+ : "i" (~mask), "r" (p) \
+ : "cc", "memory"); \
+ } else { \
+ asm volatile ( \
+ prefix \
+ "1:" PPC_LLARX(%0,0,%3,0) "\n" \
+ "andc %0,%0,%2\n" \
+ PPC_STLCX "%0,0,%3\n" \
+ "bne- 1b\n" \
+ : "=&r" (old), "+m" (*p) \
+ : "r" (mask), "r" (p) \
+ : "cc", "memory"); \
+ } \
+}
+
+DEFINE_CLROP(clear_bits, "")
+DEFINE_CLROP(clear_bits_unlock, PPC_RELEASE_BARRIER)
+
static inline void arch_set_bit(int nr, volatile unsigned long *addr)
{
set_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
@@ -116,12 +146,12 @@ static inline unsigned long fn( \
__asm__ __volatile__ ( \
prefix \
"1:" PPC_LLARX(%0,0,%3,eh) "\n" \
- stringify_in_c(op) "%1,%0,%2\n" \
+ #op "%I2 %1,%0,%2\n" \
PPC_STLCX "%1,0,%3\n" \
"bne- 1b\n" \
postfix \
: "=&r" (old), "=&r" (t) \
- : "r" (mask), "r" (p) \
+ : "rK" (mask), "r" (p) \
: "cc", "memory"); \
return (old & mask); \
}
@@ -130,11 +160,42 @@ DEFINE_TESTOP(test_and_set_bits, or, PPC_ATOMIC_ENTRY_BARRIER,
PPC_ATOMIC_EXIT_BARRIER, 0)
DEFINE_TESTOP(test_and_set_bits_lock, or, "",
PPC_ACQUIRE_BARRIER, 1)
-DEFINE_TESTOP(test_and_clear_bits, andc, PPC_ATOMIC_ENTRY_BARRIER,
- PPC_ATOMIC_EXIT_BARRIER, 0)
DEFINE_TESTOP(test_and_change_bits, xor, PPC_ATOMIC_ENTRY_BARRIER,
PPC_ATOMIC_EXIT_BARRIER, 0)
+static inline unsigned long test_and_clear_bits(unsigned long mask, volatile unsigned long *_p)
+{
+ unsigned long old, t;
+ unsigned long *p = (unsigned long *)_p;
+
+ if (IS_ENABLED(CONFIG_PPC32) &&
+ __builtin_constant_p(mask) && !(mask & (mask - 1))) {
+ asm volatile (
+ PPC_ATOMIC_ENTRY_BARRIER
+ "1:" PPC_LLARX(%0,0,%3,0) "\n"
+ "rlwinm %1,%0,0,%2\n"
+ PPC_STLCX "%1,0,%3\n"
+ "bne- 1b\n"
+ PPC_ATOMIC_EXIT_BARRIER
+ : "=&r" (old), "=&r" (t)
+ : "i" (~mask), "r" (p)
+ : "cc", "memory");
+ } else {
+ asm volatile (
+ PPC_ATOMIC_ENTRY_BARRIER
+ "1:" PPC_LLARX(%0,0,%3,0) "\n"
+ "andc %1,%0,%2\n"
+ PPC_STLCX "%1,0,%3\n"
+ "bne- 1b\n"
+ PPC_ATOMIC_EXIT_BARRIER
+ : "=&r" (old), "=&r" (t)
+ : "r" (mask), "r" (p)
+ : "cc", "memory");
+ }
+
+ return (old & mask);
+}
+
static inline int arch_test_and_set_bit(unsigned long nr,
volatile unsigned long *addr)
{
--
2.25.0
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