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clang-p2996/llvm/test/CodeGen/WebAssembly/reg-stackify.ll
Wouter van Oortmerssen 8a9cb242fb [WebAssembly] Added default stack-only instruction mode for MC. 
Summary:
Made it convert from register to stack based instructions, and removed the registers.
Fixes to related code that was expecting register based instructions.
Added the correct testing flag to all tests, depending on what the
format they were expecting so far.
Translated one test to stack format as example: reg-stackify-stack.ll

tested:
llvm-lit -v `find test -name WebAssembly`
unittests/MC/*

Reviewers: dschuff, sunfish

Subscribers: sbc100, jgravelle-google, eraman, aheejin, llvm-commits, jfb

Differential Revision: https://reviews.llvm.org/D51241

llvm-svn: 340750
2018-08-27 15:45:51 +00:00

690 lines
23 KiB
LLVM
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; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs | FileCheck %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -verify-machineinstrs | FileCheck %s --check-prefix=NOREGS
; Test the register stackifier pass.
; We have two sets of tests, one with registers and implicit locals, and
; a stack / explicit locals based version (NOREGS).
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
; No because of pointer aliasing.
; CHECK-LABEL: no0:
; CHECK: return $1{{$}}
; NOREGS-LABEL: no0:
; NOREGS: return{{$}}
define i32 @no0(i32* %p, i32* %q) {
%t = load i32, i32* %q
store i32 0, i32* %p
ret i32 %t
}
; No because of side effects.
; CHECK-LABEL: no1:
; CHECK: return $1{{$}}
; NOREGS-LABEL: no1:
; NOREGS: return{{$}}
define i32 @no1(i32* %p, i32* dereferenceable(4) %q) {
%t = load volatile i32, i32* %q, !invariant.load !0
store volatile i32 0, i32* %p
ret i32 %t
}
; Yes because of invariant load and no side effects.
; CHECK-LABEL: yes0:
; CHECK: return $pop{{[0-9]+}}{{$}}
; NOREGS-LABEL: yes0:
; NOREGS: return{{$}}
define i32 @yes0(i32* %p, i32* dereferenceable(4) %q) {
%t = load i32, i32* %q, !invariant.load !0
store i32 0, i32* %p
ret i32 %t
}
; Yes because of no intervening side effects.
; CHECK-LABEL: yes1:
; CHECK: return $pop0{{$}}
; NOREGS-LABEL: yes1:
; NOREGS: return{{$}}
define i32 @yes1(i32* %q) {
%t = load volatile i32, i32* %q
ret i32 %t
}
; Yes because undefined behavior can be sunk past a store.
; CHECK-LABEL: sink_trap:
; CHECK: return $pop{{[0-9]+}}{{$}}
; NOREGS-LABEL: sink_trap:
; NOREGS: return{{$}}
define i32 @sink_trap(i32 %x, i32 %y, i32* %p) {
%t = sdiv i32 %x, %y
store volatile i32 0, i32* %p
ret i32 %t
}
; Yes because the call is readnone.
; CHECK-LABEL: sink_readnone_call:
; CHECK: return $pop0{{$}}
; NOREGS-LABEL: sink_readnone_call:
; NOREGS: return{{$}}
declare i32 @readnone_callee() readnone nounwind
define i32 @sink_readnone_call(i32 %x, i32 %y, i32* %p) {
%t = call i32 @readnone_callee()
store volatile i32 0, i32* %p
ret i32 %t
}
; No because the call is readonly and there's an intervening store.
; CHECK-LABEL: no_sink_readonly_call:
; CHECK: return ${{[0-9]+}}{{$}}
; NOREGS-LABEL: no_sink_readonly_call:
; NOREGS: return{{$}}
declare i32 @readonly_callee() readonly nounwind
define i32 @no_sink_readonly_call(i32 %x, i32 %y, i32* %p) {
%t = call i32 @readonly_callee()
store i32 0, i32* %p
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 $2 down. However, this
; would risk getting incorrect liveness if the instructions are later
; rearranged to make the stack contiguous.
; CHECK-LABEL: stack_uses:
; CHECK: .param i32, i32, i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: block {{$}}
; CHECK-NEXT: i32.const $push[[L13:[0-9]+]]=, 1{{$}}
; CHECK-NEXT: i32.lt_s $push[[L0:[0-9]+]]=, $0, $pop[[L13]]{{$}}
; CHECK-NEXT: i32.const $push[[L1:[0-9]+]]=, 2{{$}}
; CHECK-NEXT: i32.lt_s $push[[L2:[0-9]+]]=, $1, $pop[[L1]]{{$}}
; CHECK-NEXT: i32.xor $push[[L5:[0-9]+]]=, $pop[[L0]], $pop[[L2]]{{$}}
; CHECK-NEXT: i32.const $push[[L12:[0-9]+]]=, 1{{$}}
; CHECK-NEXT: i32.lt_s $push[[L3:[0-9]+]]=, $2, $pop[[L12]]{{$}}
; CHECK-NEXT: i32.const $push[[L11:[0-9]+]]=, 2{{$}}
; CHECK-NEXT: i32.lt_s $push[[L4:[0-9]+]]=, $3, $pop[[L11]]{{$}}
; CHECK-NEXT: i32.xor $push[[L6:[0-9]+]]=, $pop[[L3]], $pop[[L4]]{{$}}
; CHECK-NEXT: i32.xor $push[[L7:[0-9]+]]=, $pop[[L5]], $pop[[L6]]{{$}}
; CHECK-NEXT: i32.const $push10=, 1{{$}}
; CHECK-NEXT: i32.ne $push8=, $pop7, $pop10{{$}}
; CHECK-NEXT: br_if 0, $pop8{{$}}
; CHECK-NEXT: i32.const $push9=, 0{{$}}
; CHECK-NEXT: return $pop9{{$}}
; CHECK-NEXT: .LBB7_2:
; CHECK-NEXT: end_block{{$}}
; CHECK-NEXT: i32.const $push14=, 1{{$}}
; CHECK-NEXT: return $pop14{{$}}
; NOREGS-LABEL: stack_uses:
; NOREGS: .param i32, i32, i32, i32{{$}}
; NOREGS-NEXT: .result i32{{$}}
; NOREGS-NEXT: block {{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: i32.const 1{{$}}
; NOREGS-NEXT: i32.lt_s
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: i32.const 2{{$}}
; NOREGS-NEXT: i32.lt_s
; NOREGS-NEXT: i32.xor {{$}}
; NOREGS-NEXT: get_local 2{{$}}
; NOREGS-NEXT: i32.const 1{{$}}
; NOREGS-NEXT: i32.lt_s
; NOREGS-NEXT: get_local 3{{$}}
; NOREGS-NEXT: i32.const 2{{$}}
; NOREGS-NEXT: i32.lt_s
; NOREGS-NEXT: i32.xor {{$}}
; NOREGS-NEXT: i32.xor {{$}}
; NOREGS-NEXT: i32.const 1{{$}}
; NOREGS-NEXT: i32.ne {{$}}
; NOREGS-NEXT: br_if 0{{$}}
; NOREGS-NEXT: i32.const 0{{$}}
; NOREGS-NEXT: return{{$}}
; NOREGS-NEXT: .LBB7_2:
; NOREGS-NEXT: end_block{{$}}
; NOREGS-NEXT: i32.const 1{{$}}
; NOREGS-NEXT: return{{$}}
define i32 @stack_uses(i32 %x, i32 %y, i32 %z, i32 %w) {
entry:
%c = icmp sle i32 %x, 0
%d = icmp sle i32 %y, 1
%e = icmp sle i32 %z, 0
%f = icmp sle i32 %w, 1
%g = xor i1 %c, %d
%h = xor i1 %e, %f
%i = xor i1 %g, %h
br i1 %i, label %true, label %false
true:
ret i32 0
false:
ret i32 1
}
; Test an interesting case where the load has multiple uses and cannot
; be trivially stackified. However, it can be stackified with a tee_local.
; CHECK-LABEL: multiple_uses:
; CHECK: .param i32, i32, i32{{$}}
; CHECK-NEXT: block {{$}}
; CHECK-NEXT: i32.load $push[[NUM0:[0-9]+]]=, 0($2){{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $3=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: i32.ge_u $push[[NUM2:[0-9]+]]=, $pop[[NUM1]], $1{{$}}
; CHECK-NEXT: br_if 0, $pop[[NUM2]]{{$}}
; CHECK-NEXT: i32.lt_u $push[[NUM3:[0-9]+]]=, $3, $0{{$}}
; CHECK-NEXT: br_if 0, $pop[[NUM3]]{{$}}
; CHECK-NEXT: i32.store 0($2), $3{{$}}
; CHECK-NEXT: .LBB8_3:
; CHECK-NEXT: end_block{{$}}
; CHECK-NEXT: return{{$}}
; NOREGS-LABEL: multiple_uses:
; NOREGS: .param i32, i32, i32{{$}}
; NOREGS: .local i32{{$}}
; NOREGS-NEXT: block {{$}}
; NOREGS-NEXT: get_local 2{{$}}
; NOREGS-NEXT: i32.load 0{{$}}
; NOREGS-NEXT: tee_local 3{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: i32.ge_u
; NOREGS-NEXT: br_if 0{{$}}
; NOREGS-NEXT: get_local 3{{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: i32.lt_u
; NOREGS-NEXT: br_if 0{{$}}
; NOREGS-NEXT: get_local 2{{$}}
; NOREGS-NEXT: get_local 3{{$}}
; NOREGS-NEXT: i32.store 0{{$}}
; NOREGS-NEXT: .LBB8_3:
; NOREGS-NEXT: end_block{{$}}
; NOREGS-NEXT: return{{$}}
define void @multiple_uses(i32* %arg0, i32* %arg1, i32* %arg2) nounwind {
bb:
br label %loop
loop:
%tmp7 = load i32, i32* %arg2
%tmp8 = inttoptr i32 %tmp7 to i32*
%tmp9 = icmp uge i32* %tmp8, %arg1
%tmp10 = icmp ult i32* %tmp8, %arg0
%tmp11 = or i1 %tmp9, %tmp10
br i1 %tmp11, label %back, label %then
then:
store i32 %tmp7, i32* %arg2
br label %back
back:
br i1 undef, label %return, label %loop
return:
ret void
}
; Don't stackify stores effects across other instructions with side effects.
; CHECK: side_effects:
; CHECK: store
; CHECK-NEXT: call
; CHECK: store
; CHECK-NEXT: call
; NOREGS: side_effects:
; NOREGS: store
; NOREGS-NEXT: call
; NOREGS: store
; NOREGS-NEXT: call
declare void @evoke_side_effects()
define hidden void @stackify_store_across_side_effects(double* nocapture %d) {
entry:
store double 2.0, double* %d
call void @evoke_side_effects()
store double 2.0, double* %d
call void @evoke_side_effects()
ret void
}
; Div instructions have side effects and can't be reordered, but this entire
; function should still be able to be stackified because it's already in
; tree order.
; CHECK-LABEL: div_tree:
; CHECK: .param i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: i32.div_s $push[[L0:[0-9]+]]=, $0, $1{{$}}
; CHECK-NEXT: i32.div_s $push[[L1:[0-9]+]]=, $2, $3{{$}}
; CHECK-NEXT: i32.div_s $push[[L2:[0-9]+]]=, $pop[[L0]], $pop[[L1]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L3:[0-9]+]]=, $4, $5{{$}}
; CHECK-NEXT: i32.div_s $push[[L4:[0-9]+]]=, $6, $7{{$}}
; CHECK-NEXT: i32.div_s $push[[L5:[0-9]+]]=, $pop[[L3]], $pop[[L4]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L6:[0-9]+]]=, $pop[[L2]], $pop[[L5]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L7:[0-9]+]]=, $8, $9{{$}}
; CHECK-NEXT: i32.div_s $push[[L8:[0-9]+]]=, $10, $11{{$}}
; CHECK-NEXT: i32.div_s $push[[L9:[0-9]+]]=, $pop[[L7]], $pop[[L8]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L10:[0-9]+]]=, $12, $13{{$}}
; CHECK-NEXT: i32.div_s $push[[L11:[0-9]+]]=, $14, $15{{$}}
; CHECK-NEXT: i32.div_s $push[[L12:[0-9]+]]=, $pop[[L10]], $pop[[L11]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L13:[0-9]+]]=, $pop[[L9]], $pop[[L12]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L14:[0-9]+]]=, $pop[[L6]], $pop[[L13]]{{$}}
; CHECK-NEXT: return $pop[[L14]]{{$}}
; NOREGS-LABEL: div_tree:
; NOREGS: .param i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32{{$}}
; NOREGS-NEXT: .result i32{{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 2{{$}}
; NOREGS-NEXT: get_local 3{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 4{{$}}
; NOREGS-NEXT: get_local 5{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 6{{$}}
; NOREGS-NEXT: get_local 7{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 8{{$}}
; NOREGS-NEXT: get_local 9{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 10{{$}}
; NOREGS-NEXT: get_local 11{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 12{{$}}
; NOREGS-NEXT: get_local 13{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: get_local 14{{$}}
; NOREGS-NEXT: get_local 15{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: i32.div_s{{$}}
; NOREGS-NEXT: return{{$}}
define i32 @div_tree(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n, i32 %o, i32 %p) {
entry:
%div = sdiv i32 %a, %b
%div1 = sdiv i32 %c, %d
%div2 = sdiv i32 %div, %div1
%div3 = sdiv i32 %e, %f
%div4 = sdiv i32 %g, %h
%div5 = sdiv i32 %div3, %div4
%div6 = sdiv i32 %div2, %div5
%div7 = sdiv i32 %i, %j
%div8 = sdiv i32 %k, %l
%div9 = sdiv i32 %div7, %div8
%div10 = sdiv i32 %m, %n
%div11 = sdiv i32 %o, %p
%div12 = sdiv i32 %div10, %div11
%div13 = sdiv i32 %div9, %div12
%div14 = sdiv i32 %div6, %div13
ret i32 %div14
}
; A simple multiple-use case.
; CHECK-LABEL: simple_multiple_use:
; CHECK: .param i32, i32{{$}}
; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: call use_a@FUNCTION, $pop[[NUM1]]{{$}}
; CHECK-NEXT: call use_b@FUNCTION, $[[NUM2]]{{$}}
; CHECK-NEXT: return{{$}}
; NOREGS-LABEL: simple_multiple_use:
; NOREGS: .param i32, i32{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: i32.mul
; NOREGS-NEXT: tee_local 1{{$}}
; NOREGS-NEXT: call use_a@FUNCTION{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: call use_b@FUNCTION{{$}}
; NOREGS-NEXT: return{{$}}
declare void @use_a(i32)
declare void @use_b(i32)
define void @simple_multiple_use(i32 %x, i32 %y) {
%mul = mul i32 %y, %x
call void @use_a(i32 %mul)
call void @use_b(i32 %mul)
ret void
}
; Multiple uses of the same value in one instruction.
; CHECK-LABEL: multiple_uses_in_same_insn:
; CHECK: .param i32, i32{{$}}
; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: call use_2@FUNCTION, $pop[[NUM1]], $[[NUM2]]{{$}}
; CHECK-NEXT: return{{$}}
; NOREGS-LABEL: multiple_uses_in_same_insn:
; NOREGS: .param i32, i32{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: i32.mul
; NOREGS-NEXT: tee_local 1{{$}}
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: call use_2@FUNCTION{{$}}
; NOREGS-NEXT: return{{$}}
declare void @use_2(i32, i32)
define void @multiple_uses_in_same_insn(i32 %x, i32 %y) {
%mul = mul i32 %y, %x
call void @use_2(i32 %mul, i32 %mul)
ret void
}
; Commute operands to achieve better stackifying.
; CHECK-LABEL: commute:
; CHECK-NOT: param
; CHECK: .result i32{{$}}
; CHECK-NEXT: i32.call $push0=, red@FUNCTION{{$}}
; CHECK-NEXT: i32.call $push1=, green@FUNCTION{{$}}
; CHECK-NEXT: i32.add $push2=, $pop0, $pop1{{$}}
; CHECK-NEXT: i32.call $push3=, blue@FUNCTION{{$}}
; CHECK-NEXT: i32.add $push4=, $pop2, $pop3{{$}}
; CHECK-NEXT: return $pop4{{$}}
; NOREGS-LABEL: commute:
; NOREGS-NOT: param
; NOREGS: .result i32{{$}}
; NOREGS-NEXT: i32.call red@FUNCTION{{$}}
; NOREGS-NEXT: i32.call green@FUNCTION{{$}}
; NOREGS-NEXT: i32.add {{$}}
; NOREGS-NEXT: i32.call blue@FUNCTION{{$}}
; NOREGS-NEXT: i32.add {{$}}
; NOREGS-NEXT: return{{$}}
declare i32 @red()
declare i32 @green()
declare i32 @blue()
define i32 @commute() {
%call = call i32 @red()
%call1 = call i32 @green()
%add = add i32 %call1, %call
%call2 = call i32 @blue()
%add3 = add i32 %add, %call2
ret i32 %add3
}
; Don't stackify a register when it would move a the def of the register past
; an implicit get_local for the register.
; CHECK-LABEL: no_stackify_past_use:
; CHECK: i32.call $1=, callee@FUNCTION, $0
; CHECK-NEXT: i32.const $push0=, 1
; CHECK-NEXT: i32.add $push1=, $0, $pop0
; CHECK-NEXT: i32.call $push2=, callee@FUNCTION, $pop1
; CHECK-NEXT: i32.sub $push3=, $pop2, $1
; CHECK-NEXT: i32.div_s $push4=, $pop3, $1
; CHECK-NEXT: return $pop4
; NOREGS-LABEL: no_stackify_past_use:
; NOREGS: get_local 0{{$}}
; NOREGS-NEXT: i32.call callee@FUNCTION
; NOREGS-NEXT: set_local 1{{$}}
; NOREGS-NEXT: get_local 0{{$}}
; NOREGS-NEXT: i32.const 1
; NOREGS-NEXT: i32.add
; NOREGS-NEXT: i32.call callee@FUNCTION
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: i32.sub
; NOREGS-NEXT: get_local 1{{$}}
; NOREGS-NEXT: i32.div_s
; NOREGS-NEXT: return
declare i32 @callee(i32)
define i32 @no_stackify_past_use(i32 %arg) {
%tmp1 = call i32 @callee(i32 %arg)
%tmp2 = add i32 %arg, 1
%tmp3 = call i32 @callee(i32 %tmp2)
%tmp5 = sub i32 %tmp3, %tmp1
%tmp6 = sdiv i32 %tmp5, %tmp1
ret i32 %tmp6
}
; This is the same as no_stackify_past_use, except using a commutative operator,
; so we can reorder the operands and stackify.
; CHECK-LABEL: commute_to_fix_ordering:
; CHECK: i32.call $push[[L0:.+]]=, callee@FUNCTION, $0
; CHECK: tee_local $push[[L1:.+]]=, $1=, $pop[[L0]]
; CHECK: i32.const $push0=, 1
; CHECK: i32.add $push1=, $0, $pop0
; CHECK: i32.call $push2=, callee@FUNCTION, $pop1
; CHECK: i32.add $push3=, $1, $pop2
; CHECK: i32.mul $push4=, $pop[[L1]], $pop3
; CHECK: return $pop4
; NOREGS-LABEL: commute_to_fix_ordering:
; NOREGS: get_local 0{{$}}
; NOREGS: i32.call callee@FUNCTION
; NOREGS: tee_local 1
; NOREGS: get_local 1{{$}}
; NOREGS: get_local 0{{$}}
; NOREGS: i32.const 1
; NOREGS: i32.add
; NOREGS: i32.call callee@FUNCTION
; NOREGS: i32.add
; NOREGS: i32.mul
; NOREGS: return
define i32 @commute_to_fix_ordering(i32 %arg) {
%tmp1 = call i32 @callee(i32 %arg)
%tmp2 = add i32 %arg, 1
%tmp3 = call i32 @callee(i32 %tmp2)
%tmp5 = add i32 %tmp3, %tmp1
%tmp6 = mul i32 %tmp5, %tmp1
ret i32 %tmp6
}
; Stackify individual defs of virtual registers with multiple defs.
; CHECK-LABEL: multiple_defs:
; CHECK: f64.add $push[[NUM0:[0-9]+]]=, ${{[0-9]+}}, $pop{{[0-9]+}}{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: f64.select $push{{[0-9]+}}=, $pop{{[0-9]+}}, $pop[[NUM1]], ${{[0-9]+}}{{$}}
; CHECK: $[[NUM2]]=,
; NOREGS-LABEL: multiple_defs:
; NOREGS: f64.add
; NOREGS: tee_local
; NOREGS: f64.select
define void @multiple_defs(i32 %arg, i32 %arg1, i1 %arg2, i1 %arg3, i1 %arg4) {
bb:
br label %bb5
bb5: ; preds = %bb21, %bb
%tmp = phi double [ 0.000000e+00, %bb ], [ %tmp22, %bb21 ]
%tmp6 = phi double [ 0.000000e+00, %bb ], [ %tmp23, %bb21 ]
%tmp7 = fcmp olt double %tmp6, 2.323450e+01
br i1 %tmp7, label %bb8, label %bb21
bb8: ; preds = %bb17, %bb5
%tmp9 = phi double [ %tmp19, %bb17 ], [ %tmp, %bb5 ]
%tmp10 = fadd double %tmp6, -1.000000e+00
%tmp11 = select i1 %arg2, double -1.135357e+04, double %tmp10
%tmp12 = fadd double %tmp11, %tmp9
br i1 %arg3, label %bb17, label %bb13
bb13: ; preds = %bb8
%tmp14 = or i32 %arg1, 2
%tmp15 = icmp eq i32 %tmp14, 14
%tmp16 = select i1 %tmp15, double -1.135357e+04, double 0xBFCE147AE147B000
br label %bb17
bb17: ; preds = %bb13, %bb8
%tmp18 = phi double [ %tmp16, %bb13 ], [ %tmp10, %bb8 ]
%tmp19 = fadd double %tmp18, %tmp12
%tmp20 = fcmp olt double %tmp6, 2.323450e+01
br i1 %tmp20, label %bb8, label %bb21
bb21: ; preds = %bb17, %bb5
%tmp22 = phi double [ %tmp, %bb5 ], [ %tmp9, %bb17 ]
%tmp23 = fadd double %tmp6, 1.000000e+00
br i1 %arg4, label %exit, label %bb5
exit:
ret void
}
; Don't move calls past loads
; CHECK-LABEL: no_stackify_call_past_load:
; CHECK: i32.call $0=, red
; CHECK: i32.const $push0=, 0
; CHECK: i32.load $1=, count($pop0)
; NOREGS-LABEL: no_stackify_call_past_load:
; NOREGS: i32.call red
; NOREGS: i32.const 0
; NOREGS: i32.load count
@count = hidden global i32 0, align 4
define i32 @no_stackify_call_past_load() {
%a = call i32 @red()
%b = load i32, i32* @count, align 4
call i32 @callee(i32 %a)
ret i32 %b
; use of a
}
; Don't move stores past loads if there may be aliasing
; CHECK-LABEL: no_stackify_store_past_load
; CHECK: i32.store 0($1), $0
; CHECK: i32.load {{.*}}, 0($2)
; CHECK: i32.call {{.*}}, callee@FUNCTION, $0{{$}}
; NOREGS-LABEL: no_stackify_store_past_load
; NOREGS: i32.store 0
; NOREGS: i32.load 0
; NOREGS: i32.call callee@FUNCTION{{$}}
define i32 @no_stackify_store_past_load(i32 %a, i32* %p1, i32* %p2) {
store i32 %a, i32* %p1
%b = load i32, i32* %p2, align 4
call i32 @callee(i32 %a)
ret i32 %b
}
; Can still stackify past invariant loads.
; CHECK-LABEL: store_past_invar_load
; CHECK: i32.store 0($1), $0
; CHECK: i32.call {{.*}}, callee@FUNCTION, $0
; CHECK: i32.load $push{{.*}}, 0($2)
; CHECK: return $pop
; NOREGS-LABEL: store_past_invar_load
; NOREGS: i32.store 0
; NOREGS: i32.call callee@FUNCTION
; NOREGS: i32.load 0
; NOREGS: return
define i32 @store_past_invar_load(i32 %a, i32* %p1, i32* dereferenceable(4) %p2) {
store i32 %a, i32* %p1
%b = load i32, i32* %p2, !invariant.load !0
call i32 @callee(i32 %a)
ret i32 %b
}
; CHECK-LABEL: ignore_dbg_value:
; CHECK-NEXT: .Lfunc_begin
; CHECK-NEXT: unreachable
; NOREGS-LABEL: ignore_dbg_value:
; NOREGS-NEXT: .Lfunc_begin
; NOREGS-NEXT: unreachable
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
define void @ignore_dbg_value() {
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !7, metadata !9), !dbg !10
unreachable
}
; Don't stackify an expression that might use the stack into a return, since we
; might insert a prologue before the return.
; CHECK-LABEL: no_stackify_past_epilogue:
; CHECK: return ${{[0-9]+}}{{$}}
; NOREGS-LABEL: no_stackify_past_epilogue:
; NOREGS: return{{$}}
declare i32 @use_memory(i32*)
define i32 @no_stackify_past_epilogue() {
%x = alloca i32
%call = call i32 @use_memory(i32* %x)
ret i32 %call
}
; Stackify a loop induction variable into a loop comparison.
; CHECK-LABEL: stackify_indvar:
; CHECK: i32.const $push[[L5:.+]]=, 1{{$}}
; CHECK-NEXT: i32.add $push[[L4:.+]]=, $[[R0:.+]], $pop[[L5]]{{$}}
; CHECK-NEXT: tee_local $push[[L3:.+]]=, $[[R0]]=, $pop[[L4]]{{$}}
; CHECK-NEXT: i32.ne $push[[L2:.+]]=, $0, $pop[[L3]]{{$}}
; NOREGS-LABEL: stackify_indvar:
; NOREGS: i32.const 1{{$}}
; NOREGS-NEXT: i32.add
; NOREGS-NEXT: tee_local 2{{$}}
; NOREGS-NEXT: i32.ne
define void @stackify_indvar(i32 %tmp, i32* %v) #0 {
bb:
br label %bb3
bb3: ; preds = %bb3, %bb2
%tmp4 = phi i32 [ %tmp7, %bb3 ], [ 0, %bb ]
%tmp5 = load volatile i32, i32* %v, align 4
%tmp6 = add nsw i32 %tmp5, %tmp4
store volatile i32 %tmp6, i32* %v, align 4
%tmp7 = add nuw nsw i32 %tmp4, 1
%tmp8 = icmp eq i32 %tmp7, %tmp
br i1 %tmp8, label %bb10, label %bb3
bb10: ; preds = %bb9, %bb
ret void
}
; Don't stackify a call past a __stack_pointer store.
; CHECK-LABEL: stackpointer_dependency:
; CHECK: call {{.+}}, stackpointer_callee@FUNCTION,
; CHECK-NEXT: set_global __stack_pointer@GLOBAL,
; NOREGS-LABEL: stackpointer_dependency:
; NOREGS: call stackpointer_callee@FUNCTION
; NOREGS: set_global __stack_pointer
declare i32 @stackpointer_callee(i8* readnone, i8* readnone)
declare i8* @llvm.frameaddress(i32)
define i32 @stackpointer_dependency(i8* readnone) {
%2 = tail call i8* @llvm.frameaddress(i32 0)
%3 = tail call i32 @stackpointer_callee(i8* %0, i8* %2)
ret i32 %3
}
; Stackify a call_indirect with respect to its ordering
; CHECK-LABEL: call_indirect_stackify:
; CHECK: i32.load $push[[L4:.+]]=, 0($0)
; CHECK-NEXT: tee_local $push[[L3:.+]]=, $0=, $pop[[L4]]
; CHECK-NEXT: i32.load $push[[L0:.+]]=, 0($0)
; CHECK-NEXT: i32.load $push[[L1:.+]]=, 0($pop[[L0]])
; CHECK-NEXT: i32.call_indirect $push{{.+}}=, $pop[[L3]], $1, $pop[[L1]]
; NOREGS-LABEL: call_indirect_stackify:
; NOREGS: i32.load 0
; NOREGS-NEXT: tee_local 0
; NOREGS: i32.load 0
; NOREGS-NEXT: i32.load 0
; NOREGS-NEXT: i32.call_indirect
%class.call_indirect = type { i32 (...)** }
define i32 @call_indirect_stackify(%class.call_indirect** %objptr, i32 %arg) {
%obj = load %class.call_indirect*, %class.call_indirect** %objptr
%addr = bitcast %class.call_indirect* %obj to i32(%class.call_indirect*, i32)***
%vtable = load i32(%class.call_indirect*, i32)**, i32(%class.call_indirect*, i32)*** %addr
%vfn = getelementptr inbounds i32(%class.call_indirect*, i32)*, i32(%class.call_indirect*, i32)** %vtable, i32 0
%f = load i32(%class.call_indirect*, i32)*, i32(%class.call_indirect*, i32)** %vfn
%ret = call i32 %f(%class.call_indirect* %obj, i32 %arg)
ret i32 %ret
}
!llvm.module.flags = !{!0}
!llvm.dbg.cu = !{!1}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 3.9.0 (trunk 266005) (llvm/trunk 266105)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3)
!2 = !DIFile(filename: "test.c", directory: "/")
!3 = !{}
!5 = distinct !DISubprogram(name: "test", scope: !2, file: !2, line: 10, type: !6, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !3)
!6 = !DISubroutineType(types: !3)
!7 = !DILocalVariable(name: "nzcnt", scope: !5, file: !2, line: 15, type: !8)
!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIExpression()
!10 = !DILocation(line: 15, column: 6, scope: !5)
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