From 209ac43b76f78e50093e37844fb56ef9bc990f5f Mon Sep 17 00:00:00 2001
From: Nick Kledzik <kledzik@apple.com>
Date: Sat, 3 Jul 2010 00:12:47 +0000
Subject: [PATCH] ARM before armv6 did not supprt 'rev' instruction

llvm-svn: 107548
---
 compiler-rt/lib/arm/bswapdi2.S | 20 ++++++++++++++++++++
 compiler-rt/lib/arm/bswapsi2.S | 11 +++++++++++
 2 files changed, 31 insertions(+)

diff --git a/compiler-rt/lib/arm/bswapdi2.S b/compiler-rt/lib/arm/bswapdi2.S
index 262171e76ca2..d5d65d77252e 100644
--- a/compiler-rt/lib/arm/bswapdi2.S
+++ b/compiler-rt/lib/arm/bswapdi2.S
@@ -16,8 +16,28 @@
 //
 	.align 2
 DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
+#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
+	// before armv6 does not have "rev" instruction
+	stmfd	sp!, {r7, lr}
+	mov	r7, sp
+	mov	r2, #255, 24
+	and	r3, r2, r1, lsr #8
+	mov	r12, #255, 16
+	and	lr, r12, r1, lsl #8
+	orr	r3, r3, r1, lsr #24
+	orr	r1, lr, r1, lsl #24
+	and	r2, r2, r0, lsr #8
+	orr	r3, r1, r3
+	orr	r1, r2, r0, lsr #24
+	and	r2, r12, r0, lsl #8
+	orr	r0, r2, r0, lsl #24
+	orr	r1, r0, r1
+	mov	r0, r3
+	ldmfd	sp!, {r7, pc}
+#else
 	rev	r2, r1		// reverse bytes in high 32-bits into temp2
 	rev	r3, r0		// reverse bytes in low 32-bit into temp3
 	mov	r0, r2		// set low 32-bits of result to temp2
 	mov	r1, r3		// set high 32-bits of result to temp3
 	bx	lr
+#endif
diff --git a/compiler-rt/lib/arm/bswapsi2.S b/compiler-rt/lib/arm/bswapsi2.S
index 74c25b86ae5e..309b202c06db 100644
--- a/compiler-rt/lib/arm/bswapsi2.S
+++ b/compiler-rt/lib/arm/bswapsi2.S
@@ -16,5 +16,16 @@
 //
 	.align 2
 DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
+#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
+	// before armv6 does not have "rev" instruction
+	mov	r1, #255, 24
+	mov	r2, #255, 16
+	and	r1, r1, r0, lsr #8
+	and	r2, r2, r0, lsl #8
+	orr	r1, r1, r0, lsr #24
+	orr	r0, r2, r0, lsl #24
+	orr	r0, r0, r1
+#else
 	rev	r0, r0		// reverse bytes in parameter and put into result register
+#endif
 	bx	lr