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; RUN: llc < %s | FileCheck %s --check-prefix NOATOMIC
; RUN: not llc < %s -mtriple=wasm32-unknown-unknown -mattr=+atomics,+sign-ext 2>&1 | FileCheck %s --check-prefixes NOEMSCRIPTEN
; RUN: not llc < %s -mtriple=wasm32-unknown-wasi -mattr=+atomics,+sign-ext 2>&1 | FileCheck %s --check-prefixes NOEMSCRIPTEN
; RUN: llc < %s -mtriple=wasm32-unknown-emscripten -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mattr=+atomics,+sign-ext | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
; NOEMSCRIPTEN: LLVM ERROR: ATOMIC_FENCE is not yet supported in non-emscripten OSes
; A multithread fence turns into 'global.get $__stack_pointer' followed by an
; idempotent atomicrmw instruction.
; CHECK-LABEL: multithread_fence:
; CHECK: global.get $push[[SP:[0-9]+]]=, __stack_pointer
; CHECK-NEXT: i32.const $push[[ZERO:[0-9]+]]=, 0
; CHECK-NEXT: i32.atomic.rmw.or $drop=, 0($pop[[SP]]), $pop[[ZERO]]
; NOATOMIC-NOT: i32.atomic.rmw.or
define void @multithread_fence() {
fence seq_cst
ret void
}
; Fences with weaker memory orderings than seq_cst should be treated the same
; because atomic memory access in wasm are sequentially consistent.
; CHECK-LABEL: multithread_weak_fence:
; CHECK: global.get $push{{.+}}=, __stack_pointer
; CHECK: i32.atomic.rmw.or
; CHECK: i32.atomic.rmw.or
; CHECK: i32.atomic.rmw.or
define void @multithread_weak_fence() {
fence acquire
fence release
fence acq_rel
ret void
}
; A singlethread fence becomes compiler_fence instruction, a pseudo instruction
; that acts as a compiler barrier. The barrier should not be emitted to .s file.
; CHECK-LABEL: singlethread_fence:
; CHECK-NOT: compiler_fence
define void @singlethread_fence() {
fence syncscope("singlethread") seq_cst
fence syncscope("singlethread") acquire
fence syncscope("singlethread") release
fence syncscope("singlethread") acq_rel
ret void
}
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