diff mbox

[RESEND] lib/mpi: fix build with clang

Message ID 20170807173120.15463-1-stefan@agner.ch (mailing list archive)
State New, archived
Headers show

Commit Message

Stefan Agner Aug. 7, 2017, 5:31 p.m. UTC 
Use just @ to denote comments which works with gcc and clang.
Otherwise clang reports an escape sequence error:
  error: invalid % escape in inline assembly string

Use %0-%3 as operand references, this avoids:
  error: invalid operand in inline asm: 'umull ${1:r}, ${0:r}, ${2:r}, ${3:r}'

Also remove superfluous casts on output operands to avoid warnings
such as:
  warning: invalid use of a cast in an inline asm context requiring an l-value

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
I checked the output of gcc with -S switch before and after this change,
gcc generated the same assembly.

Resend this time with linux-crypto ML.

--
Stefan

 lib/mpi/longlong.h | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

Comments

Herbert Xu Aug. 17, 2017, 9 a.m. UTC | #1 
On Mon, Aug 07, 2017 at 10:31:20AM -0700, Stefan Agner wrote:
> Use just @ to denote comments which works with gcc and clang.
> Otherwise clang reports an escape sequence error:
>   error: invalid % escape in inline assembly string
> 
> Use %0-%3 as operand references, this avoids:
>   error: invalid operand in inline asm: 'umull ${1:r}, ${0:r}, ${2:r}, ${3:r}'
> 
> Also remove superfluous casts on output operands to avoid warnings
> such as:
>   warning: invalid use of a cast in an inline asm context requiring an l-value
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> Acked-by: Arnd Bergmann <arnd@arndb.de>

Patch applied.  Thanks.
diff mbox

Patch

diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
index 93336502af08..57fd45ab7af1 100644
--- a/lib/mpi/longlong.h
+++ b/lib/mpi/longlong.h
@@ -176,8 +176,8 @@  extern UDItype __udiv_qrnnd(UDItype *, UDItype, UDItype, UDItype);
 #define add_ssaaaa(sh, sl, ah, al, bh, bl) \
 	__asm__ ("adds %1, %4, %5\n" \
 		"adc  %0, %2, %3" \
-	: "=r" ((USItype)(sh)), \
-		"=&r" ((USItype)(sl)) \
+	: "=r" (sh), \
+		"=&r" (sl) \
 	: "%r" ((USItype)(ah)), \
 		"rI" ((USItype)(bh)), \
 		"%r" ((USItype)(al)), \
@@ -185,15 +185,15 @@  extern UDItype __udiv_qrnnd(UDItype *, UDItype, UDItype, UDItype);
 #define sub_ddmmss(sh, sl, ah, al, bh, bl) \
 	__asm__ ("subs %1, %4, %5\n" \
 		"sbc  %0, %2, %3" \
-	: "=r" ((USItype)(sh)), \
-		"=&r" ((USItype)(sl)) \
+	: "=r" (sh), \
+		"=&r" (sl) \
 	: "r" ((USItype)(ah)), \
 		"rI" ((USItype)(bh)), \
 		"r" ((USItype)(al)), \
 		"rI" ((USItype)(bl)))
 #if defined __ARM_ARCH_2__ || defined __ARM_ARCH_3__
 #define umul_ppmm(xh, xl, a, b) \
-	__asm__ ("%@ Inlined umul_ppmm\n" \
+	__asm__ ("@ Inlined umul_ppmm\n" \
 		"mov	%|r0, %2, lsr #16		@ AAAA\n" \
 		"mov	%|r2, %3, lsr #16		@ BBBB\n" \
 		"bic	%|r1, %2, %|r0, lsl #16		@ aaaa\n" \
@@ -206,19 +206,19 @@  extern UDItype __udiv_qrnnd(UDItype *, UDItype, UDItype, UDItype);
 		"addcs	%|r2, %|r2, #65536\n" \
 		"adds	%1, %|r1, %|r0, lsl #16\n" \
 		"adc	%0, %|r2, %|r0, lsr #16" \
-	: "=&r" ((USItype)(xh)), \
-		"=r" ((USItype)(xl)) \
+	: "=&r" (xh), \
+		"=r" (xl) \
 	: "r" ((USItype)(a)), \
 		"r" ((USItype)(b)) \
 	: "r0", "r1", "r2")
 #else
 #define umul_ppmm(xh, xl, a, b) \
-	__asm__ ("%@ Inlined umul_ppmm\n" \
-		"umull %r1, %r0, %r2, %r3" \
-	: "=&r" ((USItype)(xh)), \
-			"=&r" ((USItype)(xl)) \
+	__asm__ ("@ Inlined umul_ppmm\n" \
+		"umull %1, %0, %2, %3" \
+	: "=&r" (xh), \
+		"=&r" (xl) \
 	: "r" ((USItype)(a)), \
-			"r" ((USItype)(b)) \
+		"r" ((USItype)(b)) \
 	: "r0", "r1")
 #endif
 #define UMUL_TIME 20