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Message-Id: <20190621195555.20615-1-malat@debian.org>
Date: Fri, 21 Jun 2019 21:55:54 +0200
From: Mathieu Malaterre <malat@...ian.org>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: Mathieu Malaterre <malat@...ian.org>,
Joel Stanley <joel@....id.au>,
Segher Boessenkool <segher@...nel.crashing.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] lib/mpi: fix build with clang
Remove superfluous casts on output operands to avoid warnings on the
following macros:
* add_ssaaaa(sh, sl, ah, al, bh, bl)
* sub_ddmmss(sh, sl, ah, al, bh, bl)
* umul_ppmm(ph, pl, m0, m1)
Special care has been taken to keep the diff as minimal as possible from
the original header file `longlong.h` from gcc, only importing the
minimal change to make the compilation with clang pass.
Silence the following warnings triggered using W=1:
CC lib/mpi/generic_mpih-mul1.o
../lib/mpi/generic_mpih-mul1.c:37:13: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
and
CC lib/mpi/generic_mpih-mul2.o
../lib/mpi/generic_mpih-mul2.c:36:13: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
1 warning generated.
CC lib/mpi/generic_mpih-mul3.o
../lib/mpi/generic_mpih-mul3.c:36:13: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
Or even:
../lib/mpi/mpih-div.c:99:16: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions
sub_ddmmss(n1, n0, n1, n0, d1, d0);
~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Inspiration is taken from commit b682c8692442 ("powerpc/math-emu: Update
macros from GCC").
Suggested-by: Joel Stanley <joel@....id.au>
Cc: Segher Boessenkool <segher@...nel.crashing.org>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
v2: Instead of passing compat flag to clang to behave as gcc, remove the superfluous cast
lib/mpi/longlong.h | 105 +++++++++++++++------------------------------
1 file changed, 35 insertions(+), 70 deletions(-)
diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
index 08c60d10747f..f5503dfa42ed 100644
--- a/lib/mpi/longlong.h
+++ b/lib/mpi/longlong.h
@@ -753,79 +753,44 @@ do { \
***************************************/
#if (defined(_ARCH_PPC) || defined(_IBMR2)) && W_TYPE_SIZE == 32
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
-do { \
- if (__builtin_constant_p(bh) && (bh) == 0) \
- __asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{aze|addze} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "%r" ((USItype)(ah)), \
- "%r" ((USItype)(al)), \
- "rI" ((USItype)(bl))); \
- else if (__builtin_constant_p(bh) && (bh) == ~(USItype) 0) \
- __asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{ame|addme} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "%r" ((USItype)(ah)), \
- "%r" ((USItype)(al)), \
- "rI" ((USItype)(bl))); \
- else \
- __asm__ ("{a%I5|add%I5c} %1,%4,%5\n\t{ae|adde} %0,%2,%3" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "%r" ((USItype)(ah)), \
- "r" ((USItype)(bh)), \
- "%r" ((USItype)(al)), \
- "rI" ((USItype)(bl))); \
-} while (0)
+ do { \
+ if (__builtin_constant_p (bh) && (bh) == 0) \
+ __asm__ ("add%I4c %1,%3,%4\n\taddze %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (ah), "%r" (al), "rI" (bl));\
+ else if (__builtin_constant_p (bh) && (bh) == ~(USItype) 0) \
+ __asm__ ("add%I4c %1,%3,%4\n\taddme %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (ah), "%r" (al), "rI" (bl));\
+ else \
+ __asm__ ("add%I5c %1,%4,%5\n\tadde %0,%2,%3" \
+ : "=r" (sh), "=&r" (sl) \
+ : "%r" (ah), "r" (bh), "%r" (al), "rI" (bl)); \
+ } while (0)
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
-do { \
- if (__builtin_constant_p(ah) && (ah) == 0) \
- __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfze|subfze} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "r" ((USItype)(bh)), \
- "rI" ((USItype)(al)), \
- "r" ((USItype)(bl))); \
- else if (__builtin_constant_p(ah) && (ah) == ~(USItype) 0) \
- __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfme|subfme} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "r" ((USItype)(bh)), \
- "rI" ((USItype)(al)), \
- "r" ((USItype)(bl))); \
- else if (__builtin_constant_p(bh) && (bh) == 0) \
- __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{ame|addme} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "r" ((USItype)(ah)), \
- "rI" ((USItype)(al)), \
- "r" ((USItype)(bl))); \
- else if (__builtin_constant_p(bh) && (bh) == ~(USItype) 0) \
- __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{aze|addze} %0,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "r" ((USItype)(ah)), \
- "rI" ((USItype)(al)), \
- "r" ((USItype)(bl))); \
- else \
- __asm__ ("{sf%I4|subf%I4c} %1,%5,%4\n\t{sfe|subfe} %0,%3,%2" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
- : "r" ((USItype)(ah)), \
- "r" ((USItype)(bh)), \
- "rI" ((USItype)(al)), \
- "r" ((USItype)(bl))); \
-} while (0)
+ do { \
+ if (__builtin_constant_p (ah) && (ah) == 0) \
+ __asm__ ("subf%I3c %1,%4,%3\n\tsubfze %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (bh), "rI" (al), "r" (bl));\
+ else if (__builtin_constant_p (ah) && (ah) == ~(USItype) 0) \
+ __asm__ ("subf%I3c %1,%4,%3\n\tsubfme %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (bh), "rI" (al), "r" (bl));\
+ else if (__builtin_constant_p (bh) && (bh) == 0) \
+ __asm__ ("subf%I3c %1,%4,%3\n\taddme %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (ah), "rI" (al), "r" (bl));\
+ else if (__builtin_constant_p (bh) && (bh) == ~(USItype) 0) \
+ __asm__ ("subf%I3c %1,%4,%3\n\taddze %0,%2" \
+ : "=r" (sh), "=&r" (sl) : "r" (ah), "rI" (al), "r" (bl));\
+ else \
+ __asm__ ("subf%I4c %1,%5,%4\n\tsubfe %0,%3,%2" \
+ : "=r" (sh), "=&r" (sl) \
+ : "r" (ah), "r" (bh), "rI" (al), "r" (bl)); \
+ } while (0)
#if defined(_ARCH_PPC)
#define umul_ppmm(ph, pl, m0, m1) \
-do { \
- USItype __m0 = (m0), __m1 = (m1); \
- __asm__ ("mulhwu %0,%1,%2" \
- : "=r" ((USItype) ph) \
- : "%r" (__m0), \
- "r" (__m1)); \
- (pl) = __m0 * __m1; \
-} while (0)
+ do { \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mulhwu %0,%1,%2" : "=r" (ph) : "%r" (m0), "r" (m1)); \
+ (pl) = __m0 * __m1; \
+ } while (0)
#define UMUL_TIME 15
#define smul_ppmm(ph, pl, m0, m1) \
do { \
--
2.20.1
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