forked from OSchip/llvm-project
369 lines
12 KiB
LLVM
369 lines
12 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs | FileCheck %s
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; Test the register stackifier pass.
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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; No because of pointer aliasing.
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; CHECK-LABEL: no0:
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; CHECK: return $1{{$}}
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define i32 @no0(i32* %p, i32* %q) {
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%t = load i32, i32* %q
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store i32 0, i32* %p
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ret i32 %t
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}
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; No because of side effects.
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; CHECK-LABEL: no1:
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; CHECK: return $1{{$}}
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define i32 @no1(i32* %p, i32* dereferenceable(4) %q) {
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%t = load volatile i32, i32* %q, !invariant.load !0
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store volatile i32 0, i32* %p
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ret i32 %t
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}
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; Yes because of invariant load and no side effects.
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; CHECK-LABEL: yes0:
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; CHECK: return $pop0{{$}}
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define i32 @yes0(i32* %p, i32* dereferenceable(4) %q) {
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%t = load i32, i32* %q, !invariant.load !0
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store i32 0, i32* %p
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ret i32 %t
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}
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; Yes because of no intervening side effects.
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; CHECK-LABEL: yes1:
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; CHECK: return $pop0{{$}}
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define i32 @yes1(i32* %q) {
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%t = load volatile i32, i32* %q
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ret i32 %t
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}
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; Don't schedule stack uses into the stack. To reduce register pressure, the
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; scheduler might be tempted to move the definition of $2 down. However, this
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; would risk getting incorrect liveness if the instructions are later
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; rearranged to make the stack contiguous.
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; CHECK-LABEL: stack_uses:
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; CHECK-NEXT: .param i32, i32, i32, i32{{$}}
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; CHECK-NEXT: .result i32{{$}}
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; CHECK-NEXT: block{{$}}
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; CHECK-NEXT: i32.const $push13=, 1{{$}}
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; CHECK-NEXT: i32.lt_s $push0=, $0, $pop13{{$}}
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; CHECK-NEXT: i32.const $push1=, 2{{$}}
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; CHECK-NEXT: i32.lt_s $push2=, $1, $pop1{{$}}
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; CHECK-NEXT: i32.xor $push5=, $pop0, $pop2{{$}}
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; CHECK-NEXT: i32.const $push12=, 1{{$}}
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; CHECK-NEXT: i32.lt_s $push3=, $2, $pop12{{$}}
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; CHECK-NEXT: i32.const $push11=, 2{{$}}
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; CHECK-NEXT: i32.lt_s $push4=, $3, $pop11{{$}}
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; CHECK-NEXT: i32.xor $push6=, $pop3, $pop4{{$}}
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; CHECK-NEXT: i32.xor $push7=, $pop5, $pop6{{$}}
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; CHECK-NEXT: i32.const $push10=, 1{{$}}
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; CHECK-NEXT: i32.ne $push8=, $pop7, $pop10{{$}}
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; CHECK-NEXT: br_if 0, $pop8{{$}}
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; CHECK-NEXT: i32.const $push9=, 0{{$}}
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; CHECK-NEXT: return $pop9{{$}}
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; CHECK-NEXT: .LBB4_2:
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; CHECK-NEXT: end_block{{$}}
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; CHECK-NEXT: i32.const $push14=, 1{{$}}
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; CHECK-NEXT: return $pop14{{$}}
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define i32 @stack_uses(i32 %x, i32 %y, i32 %z, i32 %w) {
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entry:
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%c = icmp sle i32 %x, 0
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%d = icmp sle i32 %y, 1
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%e = icmp sle i32 %z, 0
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%f = icmp sle i32 %w, 1
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%g = xor i1 %c, %d
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%h = xor i1 %e, %f
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%i = xor i1 %g, %h
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br i1 %i, label %true, label %false
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true:
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ret i32 0
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false:
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ret i32 1
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}
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; Test an interesting case where the load has multiple uses and cannot
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; be trivially stackified. However, it can be stackified with a tee_local.
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; CHECK-LABEL: multiple_uses:
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; CHECK-NEXT: .param i32, i32, i32{{$}}
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; CHECK-NEXT: .local i32{{$}}
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; CHECK-NEXT: block{{$}}
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; CHECK-NEXT: i32.load $push[[NUM0:[0-9]+]]=, 0($2){{$}}
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; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $3=, $pop[[NUM0]]{{$}}
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; CHECK-NEXT: i32.ge_u $push[[NUM2:[0-9]+]]=, $pop[[NUM1]], $1{{$}}
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; CHECK-NEXT: br_if 0, $pop[[NUM2]]{{$}}
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; CHECK-NEXT: i32.lt_u $push[[NUM3:[0-9]+]]=, $3, $0{{$}}
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; CHECK-NEXT: br_if 0, $pop[[NUM3]]{{$}}
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; CHECK-NEXT: i32.store $discard=, 0($2), $3{{$}}
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; CHECK-NEXT: .LBB5_3:
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; CHECK-NEXT: end_block{{$}}
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; CHECK-NEXT: return{{$}}
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define void @multiple_uses(i32* %arg0, i32* %arg1, i32* %arg2) nounwind {
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bb:
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br label %loop
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loop:
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%tmp7 = load i32, i32* %arg2
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%tmp8 = inttoptr i32 %tmp7 to i32*
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%tmp9 = icmp uge i32* %tmp8, %arg1
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%tmp10 = icmp ult i32* %tmp8, %arg0
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%tmp11 = or i1 %tmp9, %tmp10
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br i1 %tmp11, label %back, label %then
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then:
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store i32 %tmp7, i32* %arg2
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br label %back
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back:
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br i1 undef, label %return, label %loop
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return:
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ret void
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}
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; Don't stackify stores effects across other instructions with side effects.
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; CHECK: side_effects:
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; CHECK: store
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; CHECK-NEXT: call
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; CHECK-NEXT: store
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; CHECK-NEXT: call
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declare void @evoke_side_effects()
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define hidden void @stackify_store_across_side_effects(double* nocapture %d) {
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entry:
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store double 2.0, double* %d
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call void @evoke_side_effects()
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store double 2.0, double* %d
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call void @evoke_side_effects()
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ret void
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}
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; Div instructions have side effects and can't be reordered, but this entire
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; function should still be able to be stackified because it's already in
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; tree order.
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; CHECK-LABEL: div_tree:
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; CHECK-NEXT: .param i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32{{$}}
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; CHECK-NEXT: .result i32{{$}}
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; CHECK-NEXT: i32.div_s $push0=, $0, $1
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; CHECK-NEXT: i32.div_s $push1=, $2, $3
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; CHECK-NEXT: i32.div_s $push2=, $pop0, $pop1
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; CHECK-NEXT: i32.div_s $push3=, $4, $5
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; CHECK-NEXT: i32.div_s $push4=, $6, $7
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; CHECK-NEXT: i32.div_s $push5=, $pop3, $pop4
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; CHECK-NEXT: i32.div_s $push6=, $pop2, $pop5
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; CHECK-NEXT: i32.div_s $push7=, $8, $9
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; CHECK-NEXT: i32.div_s $push8=, $10, $11
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; CHECK-NEXT: i32.div_s $push9=, $pop7, $pop8
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; CHECK-NEXT: i32.div_s $push10=, $12, $13
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; CHECK-NEXT: i32.div_s $push11=, $14, $15
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; CHECK-NEXT: i32.div_s $push12=, $pop10, $pop11
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; CHECK-NEXT: i32.div_s $push13=, $pop9, $pop12
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; CHECK-NEXT: i32.div_s $push14=, $pop6, $pop13
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; CHECK-NEXT: return $pop14
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define i32 @div_tree(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n, i32 %o, i32 %p) {
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entry:
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%div = sdiv i32 %a, %b
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%div1 = sdiv i32 %c, %d
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%div2 = sdiv i32 %div, %div1
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%div3 = sdiv i32 %e, %f
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%div4 = sdiv i32 %g, %h
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%div5 = sdiv i32 %div3, %div4
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%div6 = sdiv i32 %div2, %div5
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%div7 = sdiv i32 %i, %j
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%div8 = sdiv i32 %k, %l
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%div9 = sdiv i32 %div7, %div8
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%div10 = sdiv i32 %m, %n
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%div11 = sdiv i32 %o, %p
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%div12 = sdiv i32 %div10, %div11
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%div13 = sdiv i32 %div9, %div12
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%div14 = sdiv i32 %div6, %div13
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ret i32 %div14
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}
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; A simple multiple-use case.
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; CHECK-LABEL: simple_multiple_use:
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; CHECK-NEXT: .param i32, i32{{$}}
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; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
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; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $0=, $pop[[NUM0]]{{$}}
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; CHECK-NEXT: call use_a@FUNCTION, $pop[[NUM1]]{{$}}
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; CHECK-NEXT: call use_b@FUNCTION, $0{{$}}
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; CHECK-NEXT: return{{$}}
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declare void @use_a(i32)
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declare void @use_b(i32)
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define void @simple_multiple_use(i32 %x, i32 %y) {
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%mul = mul i32 %y, %x
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call void @use_a(i32 %mul)
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call void @use_b(i32 %mul)
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ret void
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}
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; Multiple uses of the same value in one instruction.
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; CHECK-LABEL: multiple_uses_in_same_insn:
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; CHECK-NEXT: .param i32, i32{{$}}
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; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
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; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $0=, $pop[[NUM0]]{{$}}
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; CHECK-NEXT: call use_2@FUNCTION, $pop[[NUM1]], $0{{$}}
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; CHECK-NEXT: return{{$}}
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declare void @use_2(i32, i32)
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define void @multiple_uses_in_same_insn(i32 %x, i32 %y) {
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%mul = mul i32 %y, %x
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call void @use_2(i32 %mul, i32 %mul)
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ret void
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}
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; Commute operands to achieve better stackifying.
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; CHECK-LABEL: commute:
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; CHECK-NEXT: .result i32{{$}}
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; CHECK-NEXT: i32.call $push0=, red@FUNCTION{{$}}
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; CHECK-NEXT: i32.call $push1=, green@FUNCTION{{$}}
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; CHECK-NEXT: i32.add $push2=, $pop0, $pop1{{$}}
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; CHECK-NEXT: i32.call $push3=, blue@FUNCTION{{$}}
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; CHECK-NEXT: i32.add $push4=, $pop2, $pop3{{$}}
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; CHECK-NEXT: return $pop4{{$}}
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declare i32 @red()
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declare i32 @green()
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declare i32 @blue()
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define i32 @commute() {
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%call = call i32 @red()
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%call1 = call i32 @green()
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%add = add i32 %call1, %call
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%call2 = call i32 @blue()
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%add3 = add i32 %add, %call2
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ret i32 %add3
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}
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; Don't stackify a register when it would move a the def of the register past
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; an implicit get_local for the register.
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; CHECK-LABEL: no_stackify_past_use:
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; CHECK: i32.call $1=, callee@FUNCTION, $0
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; CHECK: i32.const $push0=, 1
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; CHECK: i32.add $push1=, $0, $pop0
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; CHECK: i32.call $push2=, callee@FUNCTION, $pop1
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; CHECK: i32.add $push3=, $1, $pop2
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; CHECK: i32.mul $push4=, $1, $pop3
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; CHECK: return $pop4
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declare i32 @callee(i32)
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define i32 @no_stackify_past_use(i32 %arg) {
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%tmp1 = call i32 @callee(i32 %arg)
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%tmp2 = add i32 %arg, 1
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%tmp3 = call i32 @callee(i32 %tmp2)
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%tmp5 = add i32 %tmp3, %tmp1
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%tmp6 = mul i32 %tmp5, %tmp1
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ret i32 %tmp6
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}
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; Stackify individual defs of virtual registers with multiple defs.
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; CHECK-LABEL: multiple_defs:
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; CHECK: f64.add $push[[NUM0:[0-9]+]]=, ${{[0-9]+}}, $pop{{[0-9]+}}{{$}}
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; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
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; CHECK-NEXT: f64.select $push{{[0-9]+}}=, $pop{{[0-9]+}}, $pop[[NUM1]], ${{[0-9]+}}{{$}}
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; CHECK: $[[NUM2]]=,
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; CHECK: $[[NUM2]]=,
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define void @multiple_defs(i32 %arg, i32 %arg1, i1 %arg2, i1 %arg3, i1 %arg4) {
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bb:
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br label %bb5
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bb5: ; preds = %bb21, %bb
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%tmp = phi double [ 0.000000e+00, %bb ], [ %tmp22, %bb21 ]
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%tmp6 = phi double [ 0.000000e+00, %bb ], [ %tmp23, %bb21 ]
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%tmp7 = fcmp olt double %tmp6, 2.323450e+01
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br i1 %tmp7, label %bb8, label %bb21
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bb8: ; preds = %bb17, %bb5
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%tmp9 = phi double [ %tmp19, %bb17 ], [ %tmp, %bb5 ]
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%tmp10 = fadd double %tmp6, -1.000000e+00
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%tmp11 = select i1 %arg2, double -1.135357e+04, double %tmp10
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%tmp12 = fadd double %tmp11, %tmp9
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br i1 %arg3, label %bb17, label %bb13
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bb13: ; preds = %bb8
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%tmp14 = or i32 %arg1, 2
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%tmp15 = icmp eq i32 %tmp14, 14
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%tmp16 = select i1 %tmp15, double -1.135357e+04, double 0xBFCE147AE147B000
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br label %bb17
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bb17: ; preds = %bb13, %bb8
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%tmp18 = phi double [ %tmp16, %bb13 ], [ %tmp10, %bb8 ]
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%tmp19 = fadd double %tmp18, %tmp12
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%tmp20 = fcmp olt double %tmp6, 2.323450e+01
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br i1 %tmp20, label %bb8, label %bb21
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bb21: ; preds = %bb17, %bb5
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%tmp22 = phi double [ %tmp, %bb5 ], [ %tmp9, %bb17 ]
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%tmp23 = fadd double %tmp6, 1.000000e+00
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br label %bb5
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}
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; Don't move calls past loads
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; CHECK-LABEL: no_stackify_call_past_load:
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; CHECK: i32.call $0=, red
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; CHECK: i32.const $push0=, 0
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; CHECK: i32.load $1=, count($pop0)
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@count = hidden global i32 0, align 4
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define i32 @no_stackify_call_past_load() {
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%a = call i32 @red()
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%b = load i32, i32* @count, align 4
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call i32 @callee(i32 %a)
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ret i32 %b
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; use of a
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}
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; Don't move stores past loads if there may be aliasing
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; CHECK-LABEL: no_stackify_store_past_load
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; CHECK: i32.store {{.*}}, 0($1), $0
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; CHECK: i32.load {{.*}}, 0($2)
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; CHECK: i32.call {{.*}}, callee@FUNCTION, $0
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define i32 @no_stackify_store_past_load(i32 %a, i32* %p1, i32* %p2) {
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store i32 %a, i32* %p1
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%b = load i32, i32* %p2, align 4
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call i32 @callee(i32 %a)
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ret i32 %b
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}
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; Can still stackify past invariant loads.
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; CHECK-LABEL: store_past_invar_load
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; CHECK: i32.store $push{{.*}}, 0($1), $0
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; CHECK: i32.call {{.*}}, callee@FUNCTION, $pop
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; CHECK: i32.load $push{{.*}}, 0($2)
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; CHECK: return $pop
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define i32 @store_past_invar_load(i32 %a, i32* %p1, i32* dereferenceable(4) %p2) {
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store i32 %a, i32* %p1
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%b = load i32, i32* %p2, !invariant.load !0
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call i32 @callee(i32 %a)
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ret i32 %b
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}
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; CHECK-LABEL: ignore_dbg_value:
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; CHECK-NEXT: unreachable
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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define void @ignore_dbg_value() {
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !1, metadata !7), !dbg !8
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unreachable
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}
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!llvm.module.flags = !{!9}
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!0 = !{}
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!1 = !DILocalVariable(name: "nzcnt", scope: !2, file: !3, line: 15, type: !6)
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!2 = distinct !DISubprogram(name: "test", scope: !3, file: !3, line: 10, type: !4, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, variables: !0)
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!3 = !DIFile(filename: "test.c", directory: "/")
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!4 = !DISubroutineType(types: !0)
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!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DIExpression()
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!8 = !DILocation(line: 15, column: 6, scope: !2)
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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