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; RUN: opt -tbaa -basicaa -licm -S < %s | FileCheck %s
; If we can prove a local is thread local, we can insert stores during
; promotion which wouldn't be legal otherwise.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-linux-generic"
@p = external global i8*
declare i8* @malloc(i64)
; Exercise the TLS case
define i32* @test(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%old = load i32, i32* %addr, align 4
; deliberate impossible to analyze branch
%guard = load atomic i8*, i8** @p monotonic, align 8
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK: store i32 %new1.lcssa, i32* %addr, align 1
ret i32* null
for.body:
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK: store i32 %new.lcssa, i32* %addr, align 1
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
declare i8* @not_malloc(i64)
; Negative test - not TLS
define i32* @test_neg(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @not_malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%old = load i32, i32* %addr, align 4
; deliberate impossible to analyze branch
%guard = load volatile i8*, i8** @p
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK-NOT: store
ret i32* null
for.body:
; CHECK-LABEL: for.body:
; CHECK: store i32 %new, i32* %addr, align 4
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK-NOT: store
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
; Negative test - can't speculate load since branch
; may control alignment
define i32* @test_neg2(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
; deliberate impossible to analyze branch
%guard = load volatile i8*, i8** @p
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK-NOT: store
ret i32* null
for.body:
; CHECK-LABEL: for.body:
; CHECK: store i32 %new, i32* %addr, align 4
%old = load i32, i32* %addr, align 4
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK-NOT: store
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
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