diff options
Diffstat (limited to 'llvm/test/CodeGen/WebAssembly/reg-stackify.ll')
| -rw-r--r-- | llvm/test/CodeGen/WebAssembly/reg-stackify.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/WebAssembly/reg-stackify.ll b/llvm/test/CodeGen/WebAssembly/reg-stackify.ll index f3000aab70a..180d70e2e4a 100644 --- a/llvm/test/CodeGen/WebAssembly/reg-stackify.ll +++ b/llvm/test/CodeGen/WebAssembly/reg-stackify.ll @@ -44,4 +44,32 @@ define i32 @yes1(i32* %q) { ret i32 %t } +; Don't schedule stack uses into the stack. To reduce register pressure, the +; scheduler might be tempted to move the definition of $2 down. However, this +; would risk getting incorrect liveness if the instructions are later +; rearranged to make the stack contiguous. + +; CHECK-LABEL: stack_uses: +; CHECK-NEXT: .param i32{{$}} +; CHECK-NEXT: .result i32{{$}} +; CHECK-NEXT: local i32, i32{{$}} +; CHECK-NEXT: i32.const $1=, 1{{$}} +; CHECK-NEXT: i32.const $2=, 0{{$}} +; CHECK-NEXT: i32.and $push0=, $0, $1{{$}} +; CHECK-NEXT: i32.eq $push1=, $pop0, $2{{$}} +; CHECK-NEXT: block BB4_2{{$}} +; CHECK-NEXT: br_if $pop1, BB4_2{{$}} +; CHECK-NEXT: return $2{{$}} +; CHECK-NEXT: BB4_2:{{$}} +; CHECK-NEXT: return $1{{$}} +define i32 @stack_uses(i32 %x) { +entry: + %c = trunc i32 %x to i1 + br i1 %c, label %true, label %false +true: + ret i32 0 +false: + ret i32 1 +} + !0 = !{} |
