llvm/test/CodeGen/WebAssembly/wide-arithmetic.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -mattr=+wide-arithmetic < %s -O2 | FileCheck %s

target triple = "wasm32-unknown-unknown"

define i128 @add_i128(i128 %a, i128 %b) {
; CHECK-LABEL: add_i128:
; CHECK:         .functype add_i128 (i32, i64, i64, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    local.get 4
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 3
; CHECK-NEXT:    local.set 4
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 4
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %c = add i128 %a, %b
  ret i128 %c
}

define i128 @sub_i128(i128 %a, i128 %b) {
; CHECK-LABEL: sub_i128:
; CHECK:         .functype sub_i128 (i32, i64, i64, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    local.get 4
; CHECK-NEXT:    i64.sub128
; CHECK-NEXT:    local.set 3
; CHECK-NEXT:    local.set 4
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 4
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %c = sub i128 %a, %b
  ret i128 %c
}

define i128 @mul_i128(i128 %a, i128 %b) {
; CHECK-LABEL: mul_i128:
; CHECK:         .functype mul_i128 (i32, i64, i64, i64, i64) -> ()
; CHECK-NEXT:    .local i64, i64
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.mul_wide_u
; CHECK-NEXT:    local.set 6
; CHECK-NEXT:    local.set 5
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 5
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 6
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 4
; CHECK-NEXT:    i64.mul
; CHECK-NEXT:    i64.add
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.mul
; CHECK-NEXT:    i64.add
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    # fallthrough-return
  %c = mul i128 %a, %b
  ret i128 %c
}

define i128 @i64_mul_wide_s(i64 %a, i64 %b) {
; CHECK-LABEL: i64_mul_wide_s:
; CHECK:         .functype i64_mul_wide_s (i32, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.mul_wide_s
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %a128 = sext i64 %a to i128
  %b128 = sext i64 %b to i128
  %c = mul i128 %a128, %b128
  ret i128 %c
}

define i128 @i64_mul_wide_u(i64 %a, i64 %b) {
; CHECK-LABEL: i64_mul_wide_u:
; CHECK:         .functype i64_mul_wide_u (i32, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.mul_wide_u
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %a128 = zext i64 %a to i128
  %b128 = zext i64 %b to i128
  %c = mul i128 %a128, %b128
  ret i128 %c
}

define i64 @mul_i128_only_lo(i128 %a, i128 %b) {
; CHECK-LABEL: mul_i128_only_lo:
; CHECK:         .functype mul_i128_only_lo (i64, i64, i64, i64) -> (i64)
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.mul
; CHECK-NEXT:    # fallthrough-return
  %c = mul i128 %a, %b
  %d = trunc i128 %c to i64
  ret i64 %d
}

declare { i64, i1 } @llvm.sadd.with.overflow.i64(i64, i64)
declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64)

; This is a codegen test to see the effect of overflowing adds on signed
; integers with wide-arithmetic enabled. At this time it doesn't actually
; generate anything differently than without wide-arithmetic but this has also
; been useful for evaluating the proposal.
define { i64, i1 } @add_wide_s(i64 %a, i64 %b) {
; CHECK-LABEL: add_wide_s:
; CHECK:         .functype add_wide_s (i32, i64, i64) -> ()
; CHECK-NEXT:    .local i64
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.add
; CHECK-NEXT:    local.tee 3
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.lt_s
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.lt_s
; CHECK-NEXT:    i32.xor
; CHECK-NEXT:    i32.store8 8
; CHECK-NEXT:    # fallthrough-return
  %pair = call { i64, i1 } @llvm.sadd.with.overflow.i64(i64 %a, i64 %b)
  ret { i64, i1 } %pair
}

define { i64, i1 } @add_wide_u(i64 %a, i64 %b) {
; CHECK-LABEL: add_wide_u:
; CHECK:         .functype add_wide_u (i32, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.store8 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %pair = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %a, i64 %b)
  ret { i64, i1 } %pair
}

; This is a model of a hypothetical `i64.add_wide3_u` instruction using LLVM
; intrinsics. In theory this should optimize better (to the equivalent below)
; but it doesn't currently.
define { i64, i64 } @add_wide3_u_via_intrinsics(i64 %a, i64 %b, i64 %c) {
; CHECK-LABEL: add_wide3_u_via_intrinsics:
; CHECK:         .functype add_wide3_u_via_intrinsics (i32, i64, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 3
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.add
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    # fallthrough-return
  %pair = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %a, i64 %b)
  %t0 = extractvalue { i64, i1 } %pair, 0
  %carry1 = extractvalue { i64, i1 } %pair, 1

  %pair2 = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %t0, i64 %c)
  %ret1 = extractvalue { i64, i1 } %pair2, 0
  %carry2 = extractvalue { i64, i1 } %pair2, 1

  %carry1_64 = zext i1 %carry1 to i64
  %carry2_64 = zext i1 %carry2 to i64
  %ret2 = add i64 %carry1_64, %carry2_64

  %r0 = insertvalue { i64, i64 } poison, i64 %ret1, 0
  %r1 = insertvalue { i64, i64 } %r0, i64 %ret2, 1
  ret { i64, i64 } %r1
}

; This is a model of a hypothetical `i64.add_wide3_u` instruction using 128-bit
; integer addition. This optimizes better than the above currently.
define { i64, i64 } @add_wide3_u_via_i128(i64 %a, i64 %b, i64 %c) {
; CHECK-LABEL: add_wide3_u_via_i128:
; CHECK:         .functype add_wide3_u_via_i128 (i32, i64, i64, i64) -> ()
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    local.get 3
; CHECK-NEXT:    i64.const 0
; CHECK-NEXT:    i64.add128
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.set 2
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.store 8
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 2
; CHECK-NEXT:    i64.store 0
; CHECK-NEXT:    # fallthrough-return
  %a128 = zext i64 %a to i128
  %b128 = zext i64 %b to i128
  %c128 = zext i64 %c to i128
  %t0 = add i128 %a128, %b128
  %t1 = add i128 %t0, %c128
  %result = trunc i128 %t1 to i64
  %t2 = lshr i128 %t1, 64
  %carry = trunc i128 %t2 to i64

  %ret0 = insertvalue { i64, i64 } poison, i64 %result, 0
  %ret1 = insertvalue { i64, i64 } %ret0, i64 %carry, 1
  ret { i64, i64 } %ret1
}

define i1 @smul64_with_overflow(i64 %a, i64 %b) {
; CHECK-LABEL: smul64_with_overflow:
; CHECK:         .functype smul64_with_overflow (i64, i64) -> (i32)
; CHECK-NEXT:  # %bb.0: # %entry
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.mul_wide_s
; CHECK-NEXT:    local.set 0
; CHECK-NEXT:    local.set 1
; CHECK-NEXT:    local.get 0
; CHECK-NEXT:    local.get 1
; CHECK-NEXT:    i64.const 63
; CHECK-NEXT:    i64.shr_s
; CHECK-NEXT:    i64.ne
; CHECK-NEXT:    # fallthrough-return
entry:
  %res = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 %a, i64 %b)
  %ov = extractvalue { i64, i1 } %res, 1
  ret i1 %ov
}

declare { i64, i1 } @llvm.smul.with.overflow.i64(i64, i64)