Add a llvm lit test for NaCl ARM/X86 support for bswap i16, i32, i64.

test/NaCl/X86/intrinsics-bitmanip.ll

+; RUN: llc -mtriple=i686-unknown-nacl -O0 -filetype=asm %s -o - | FileCheck %s \
+; RUN:   --check-prefix=NACL32
+; RUN: llc -mtriple=i686-unknown-nacl -filetype=asm %s -o - | FileCheck %s \
+; RUN:   --check-prefix=NACL32
+; RUN: llc -mtriple=x86_64-unknown-nacl -O0 -filetype=asm %s -o - | \
+; RUN:   FileCheck %s --check-prefix=NACL64
+; RUN: llc -mtriple=x86_64-unknown-nacl -filetype=asm %s -o - | \
+; RUN:   FileCheck %s --check-prefix=NACL64
+
+; Test that various bit manipulation intrinsics are supported by the
+; NaCl X86-32 and X86-64 backends.
+
+declare i16 @llvm.bswap.i16(i16)
+declare i32 @llvm.bswap.i32(i32)
+declare i64 @llvm.bswap.i64(i64)
+
+; NACL32: test_bswap_16
+; NACL32: rolw $8, %{{.*}}
+; NACL64: test_bswap_16
+; NACL64: rolw $8, %{{.*}}
+define i16 @test_bswap_16(i16 %a) {
+  %b = call i16 @llvm.bswap.i16(i16 %a)
+  ret i16 %b
+}
+
+; NACL32: test_bswap_const_16
+; NACL32: movw $-12885, %ax # imm = 0xFFFFFFFFFFFFCDAB
+; NACL64: test_bswap_const_16
+; NACL64: movw $-12885, %ax # imm = 0xFFFFFFFFFFFFCDAB
+define i16 @test_bswap_const_16() {
+  ; 0xabcd
+  %a = call i16 @llvm.bswap.i16(i16 43981)
+  ret i16 %a
+}
+
+; NACL32: test_bswap_32
+; NACL32: bswapl %eax
+; NACL64: test_bswap_32
+; NACL64: bswapl %edi
+define i32 @test_bswap_32(i32 %a) {
+  %b = call i32 @llvm.bswap.i32(i32 %a)
+  ret i32 %b
+}
+
+; NACL32: test_bswap_const_32
+; NACL32: movl $32492971, %eax # imm = 0x1EFCDAB
+; NACL64: test_bswap_const_32
+; NACL64: movl $32492971, %eax # imm = 0x1EFCDAB
+define i32 @test_bswap_const_32() {
+  ; 0xabcdef01
+  %a = call i32 @llvm.bswap.i32(i32 2882400001)
+  ret i32 %a
+}
+
+; NACL32: test_bswap_64
+; NACL32: bswapl %e{{.*}}
+; NACL32: bswapl %e{{.*}}
+; NACL64: test_bswap_64
+; NACL64: bswapq %rdi
+define i64 @test_bswap_64(i64 %a) {
+  %b = call i64 @llvm.bswap.i64(i64 %a)
+  ret i64 %b
+}
+
+; NACL32: test_bswap_const_64
+; NACL32: movl $32492971, %eax # imm = 0x1EFCDAB
+; NACL32: movl $-1989720797, %edx # imm = 0xFFFFFFFF89674523
+; NACL64: test_bswap_const_64
+; NACL64: movabsq       $-8545785751253561941, %rax # imm = 0x8967452301EFCDAB
+define i64 @test_bswap_const_64(i64 %a) {
+  ; 0xabcdef01 23456789
+  %b = call i64 @llvm.bswap.i64(i64 12379813738877118345)
+  ret i64 %b
+}