forked from OSchip/llvm-project
89 lines
2.4 KiB
LLVM
89 lines
2.4 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-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{{$}}
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; CHECK-NEXT: .local i32, i32{{$}}
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; CHECK-NEXT: i32.const $4=, 1{{$}}
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; CHECK-NEXT: i32.const $5=, 2{{$}}
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; CHECK-NEXT: i32.lt_s $push0=, $0, $4{{$}}
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; CHECK-NEXT: i32.lt_s $push1=, $1, $5{{$}}
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; CHECK-NEXT: i32.xor $push4=, $pop0, $pop1{{$}}
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; CHECK-NEXT: i32.lt_s $push2=, $2, $4{{$}}
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; CHECK-NEXT: i32.lt_s $push3=, $3, $5{{$}}
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; CHECK-NEXT: i32.xor $push5=, $pop2, $pop3{{$}}
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; CHECK-NEXT: i32.xor $push6=, $pop4, $pop5{{$}}
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; CHECK-NEXT: i32.ne $push7=, $pop6, $4{{$}}
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; CHECK-NEXT: block BB4_2{{$}}
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; CHECK-NEXT: br_if $pop7, BB4_2{{$}}
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; CHECK-NEXT: i32.const $push8=, 0{{$}}
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; CHECK-NEXT: return $pop8{{$}}
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; CHECK-NEXT: BB4_2:
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; CHECK-NEXT: return $4{{$}}
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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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!0 = !{}
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