r216446 - arm_acle: Implement swap intrinsic

[Yi Kong]

Author: kongyi
Date: Tue Aug 26 04:50:54 2014
New Revision: 216446

URL: http://llvm.org/viewvc/llvm-project?rev=216446&view=rev
Log:
arm_acle: Implement swap intrinsic

Insert the LDREX/STREX instruction sequence specified in ARM ACLE 2.0,
as SWP instruction is deprecated since ARMv6.

Modified:
    cfe/trunk/lib/Headers/arm_acle.h
    cfe/trunk/test/CodeGen/arm_acle.c

Modified: cfe/trunk/lib/Headers/arm_acle.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Headers/arm_acle.h?rev=216446&r1=216445&r2=216446&view=diff
==============================================================================
--- cfe/trunk/lib/Headers/arm_acle.h (original)
+++ cfe/trunk/lib/Headers/arm_acle.h Tue Aug 26 04:50:54 2014
@@ -66,6 +66,14 @@ static __inline__ void __attribute__((al
 }
 #endif
 
+/* 8.5 Swap */
+static __inline__ uint32_t __attribute__((always_inline, nodebug))
+  __swp(uint32_t x, volatile uint32_t *p) {
+  uint32_t v;
+  do v = __builtin_arm_ldrex(p); while (__builtin_arm_strex(x, p));
+  return v;
+}
+
 /* 8.6 Memory prefetch intrinsics */
 /* 8.6.1 Data prefetch */
 #define __pld(addr) __pldx(0, 0, 0, addr)

Modified: cfe/trunk/test/CodeGen/arm_acle.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/arm_acle.c?rev=216446&r1=216445&r2=216446&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/arm_acle.c (original)
+++ cfe/trunk/test/CodeGen/arm_acle.c Tue Aug 26 04:50:54 2014
@@ -62,6 +62,16 @@ void test_sevl(void) {
   __sevl();
 }
 
+/* 8.5 Swap */
+// ARM-LABEL: test_swp
+// AArch32: call i32 @llvm.arm.ldrex
+// AArch32: call i32 @llvm.arm.strex
+// AArch64: call i64 @llvm.aarch64.ldxr
+// AArch64: call i32 @llvm.aarch64.stxr
+uint32_t test_swp(uint32_t x, volatile void *p) {
+  __swp(x, p);
+}
+
 /* 8.6 Memory prefetch intrinsics */
 /* 8.6.1 Data prefetch */
 // ARM-LABEL: test_pld