Add test case for testing InstCombine with arbitrary precision integer

types. These tests mimic the integer test cases in the normal InstCombine
test suite but use "strange" integer bit widths.

Most tests written by Zhou Sheng, a few by me.

llvm-svn: 35284

1 files changed, 59 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/apint-and1.ll b/llvm/test/Transforms/InstCombine/apint-and1.ll
new file mode 100644
index 00000000000..11e504a1824
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/apint-and1.ll
@@ -0,0 +1,59 @@
+; This test makes sure that and instructions are properly eliminated.
+; This test is for Integer BitWidth <= 64 && BitWidth % 8 != 0.
+
+; RUN: llvm-as < %s | opt -instcombine -disable-output &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 'and '
+
+implementation
+
+define i39 @test0(i39 %A) {
+        %B = and i39 %A, 0 ; zero result
+        ret i39 %B
+}
+
+define i47 @test1(i47 %A, i47 %B) {
+        ;; (~A & ~B) == (~(A | B)) - De Morgan's Law
+        %NotA = xor i47 %A, -1
+        %NotB = xor i47 %B, -1
+        %C1 = and i47 %NotA, %NotB
+        ret i47 %C1
+}
+
+define i15 @test2(i15 %x) {
+        %tmp.2 = and i15 %x, -1 ; noop
+        ret i15 %tmp.2
+}
+
+define i23 @test3(i23 %x) {
+        %tmp.0 = and i23 %x, 127
+        %tmp.2 = and i23 %tmp.0, 128
+        ret i23 %tmp.2
+}
+
+define i1 @test4(i37 %x) {
+        %A = and i37 %x, -2147483648
+        %B = icmp ne i37 %A, 0
+        ret i1 %B
+}
+
+define i7 @test5(i7 %A, i7* %P) {
+        %B = or i7 %A, 3
+        %C = xor i7 %B, 12
+        store i7 %C, i7* %P
+        %r = and i7 %C, 3
+        ret i7 %r
+}
+
+define i7 @test6(i7 %A, i7 %B) {
+        ;; ~(~X & Y) --> (X | ~Y)
+        %t0 = xor i7 %A, -1
+        %t1 = and i7 %t0, %B
+        %r = xor i7 %t1, -1
+        ret i7 %r
+}
+
+define i47 @test7(i47 %A) {
+        %X = ashr i47 %A, 39 ;; sign extend
+        %C1 = and i47 %X, 255
+        ret i47 %C1
+}