Lower a few basic ARM binops for i{8,16,32,64}.

tests_lit/llvm2ice_tests/arith.ll

+; Assembly test for simple arithmetic operations.

[jvoung (off chromium), 2015/05/18 23:31:40]

Almost a dupe of arith-opt.ll, but tests assembly instead of "verbose inst".
Thought we might as well keep some tests of "verbose inst", but wasn't sure of
any preference.

+
+; RUN: %p2i --filetype=obj --disassemble -i %s --args -O2 | FileCheck %s
+
+; TODO(jvoung): Stop skipping unimplemented parts (via --skip-unimplemented)
+; once enough infrastructure is in. Also, switch to --filetype=obj
+; when possible.
+; RUN: %if --need=target_ARM32 --command %p2i --filetype=asm --assemble \
+; RUN:   --disassemble --target arm32 -i %s --args -O2 --skip-unimplemented \
+; RUN:   | %if --need=target_ARM32 --command FileCheck --check-prefix ARM32 %s
+
+define i32 @Add(i32 %a, i32 %b) {
+entry:
+  %add = add i32 %b, %a
+  ret i32 %add
+}
+; CHECK-LABEL: Add
+; CHECK: add e
+; ARM32-LABEL: Add
+; ARM32: add r
+
+define i32 @And(i32 %a, i32 %b) {
+entry:
+  %and = and i32 %b, %a
+  ret i32 %and
+}
+; CHECK-LABEL: And
+; CHECK: and e
+; ARM32-LABEL: And
+; ARM32: and r
+
+define i32 @Or(i32 %a, i32 %b) {
+entry:
+  %or = or i32 %b, %a
+  ret i32 %or
+}
+; CHECK-LABEL: Or
+; CHECK: or e
+; ARM32-LABEL: Or
+; ARM32: orr r
+
+define i32 @Xor(i32 %a, i32 %b) {
+entry:
+  %xor = xor i32 %b, %a
+  ret i32 %xor
+}
+; CHECK-LABEL: Xor
+; CHECK: xor e
+; ARM32-LABEL: Xor
+; ARM32: eor r
+
+define i32 @Sub(i32 %a, i32 %b) {
+entry:
+  %sub = sub i32 %a, %b
+  ret i32 %sub
+}
+; CHECK-LABEL: Sub
+; CHECK: sub e
+; ARM32-LABEL: Sub
+; ARM32: sub r
+
+define i32 @Mul(i32 %a, i32 %b) {
+entry:
+  %mul = mul i32 %b, %a
+  ret i32 %mul
+}
+; CHECK-LABEL: Mul
+; CHECK: imul e
+; ARM32-LABEL: Mul
+; ARM32: mul r
+
+; Check for a valid ARM mul instruction where operands have to be registers.
+; On the other hand x86-32 does allow an immediate.
+define i32 @MulImm(i32 %a, i32 %b) {
+entry:
+  %mul = mul i32 %a, 99
+  ret i32 %mul
+}
+; CHECK-LABEL: MulImm
+; CHECK: imul e{{.*}},e{{.*}},0x63
+; ARM32-LABEL: MulImm
+; ARM32: mov {{.*}}, #99
+; ARM32: mul r{{.*}}, r{{.*}}, r{{.*}}
+
+; Check for a valid addressing mode in the x86-32 mul instruction when
+; the second source operand is an immediate.
+define i64 @MulImm64(i64 %a) {
+entry:
+  %mul = mul i64 %a, 99
+  ret i64 %mul
+}
+; CHECK-LABEL: MulImm64
+; CHECK: mov {{.*}},0x63
+; CHECK-NOT: mul {{[0-9]+}}
+;
+; The ARM lowering is currently a bit inefficient for small 64-bit constants.
+; The top bits will be 0 and the instructions modeling that multiply by 0
+; are not eliminated.
+; ARM32-LABEL: MulImm64
+; ARM32: mov {{.*}}, #99
+; ARM32: mov {{.*}}, #0
+; ARM32: mul r
+; ARM32: mla r
+; ARM32: umull r
+; ARM32: add r
+
+define i32 @Sdiv(i32 %a, i32 %b) {
+entry:
+  %div = sdiv i32 %a, %b
+  ret i32 %div
+}
+; CHECK-LABEL: Sdiv
+; CHECK: cdq
+; CHECK: idiv e
+; ARM32-LABEL: Sdiv
+; TODO(jvoung) -- implement divide and check here.
+; The lowering needs to check if the denominator is 0 and trap, since
+; ARM normally doesn't trap on divide by 0.
+
+define i32 @Srem(i32 %a, i32 %b) {
+entry:
+  %rem = srem i32 %a, %b
+  ret i32 %rem
+}
+; CHECK-LABEL: Srem
+; CHECK: cdq
+; CHECK: idiv e
+; ARM32-LABEL: Srem
+
+define i32 @Udiv(i32 %a, i32 %b) {
+entry:
+  %div = udiv i32 %a, %b
+  ret i32 %div
+}
+; CHECK-LABEL: Udiv
+; CHECK: div e
+; ARM32-LABEL: Udiv
+
+define i32 @Urem(i32 %a, i32 %b) {
+entry:
+  %rem = urem i32 %a, %b
+  ret i32 %rem
+}
+; CHECK-LABEL: Urem
+; CHECK: div e
+; ARM32-LABEL: Urem