new testcases for integer abs function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35880 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/ARM/iabs.ll

@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | llc -march=arm -stats 2>&1 | grep '3 .*Number of machine instrs printed' &&
+; RUN: llvm-as < %s | llc -march=thumb -stats 2>&1 | grep '4 .*Number of machine instrs printed'
+
+;; Integer absolute value, should produce something as good as: ARM:
+;;   add r3, r0, r0, asr #31
+;;   eor r0, r3, r0, asr #31
+;;   bx lr
+;; Thumb:
+;;   asr r2, r0, #31
+;;   add r0, r0, r2
+;;   eor r0, r2
+;;   bx lr
+
+define i32 @test(i32 %a) {
+        %tmp1neg = sub i32 0, %a
+        %b = icmp sgt i32 %a, -1
+        %abs = select i1 %b, i32 %a, i32 %tmp1neg
+        ret i32 %abs
+}
+

test/CodeGen/PowerPC/iabs.ll

@@ -0,0 +1,14 @@
+; RUN: llvm-as < %s | llc -march=ppc32 -stats 2>&1 | grep '4 .*Number of machine instrs printed'
+
+;; Integer absolute value, should produce something as good as:
+;;      srawi r2, r3, 31
+;;      add r3, r3, r2
+;;      xor r3, r3, r2
+;;      blr 
+define i32 @test(i32 %a) {
+        %tmp1neg = sub i32 0, %a
+        %b = icmp sgt i32 %a, -1
+        %abs = select i1 %b, i32 %a, i32 %tmp1neg
+        ret i32 %abs
+}
+

test/CodeGen/X86/iabs.ll

@@ -0,0 +1,16 @@
+; RUN: llvm-as < %s | llc -march=x86-64 -stats 2>&1 | grep '6 .*Number of machine instrs printed'
+
+;; Integer absolute value, should produce something at least as good as:
+;;       movl %edi, %eax
+;;       sarl $31, %eax
+;;       addl %eax, %edi
+;;       xorl %eax, %edi
+;;       movl %edi, %eax
+;;       ret
+define i32 @test(i32 %a) {
+        %tmp1neg = sub i32 0, %a
+        %b = icmp sgt i32 %a, -1
+        %abs = select i1 %b, i32 %a, i32 %tmp1neg
+        ret i32 %abs
+}
+