; RUN: opt -mtriple=thumbv8.1m.main-none-none-eabi -hardware-loops %s -S -o - | \
; RUN: FileCheck %s
; RUN: opt -mtriple=thumbv8.1m.main -loop-unroll -unroll-remainder=false -S < %s | \
; RUN: llc -mtriple=thumbv8.1m.main | FileCheck %s --check-prefix=CHECK-UNROLL
; RUN: opt -mtriple=thumbv8.1m.main-none-none-eabi -hardware-loops \
; RUN: -pass-remarks-analysis=hardware-loops %s -S -o - 2>&1 | \
; RUN: FileCheck %s --check-prefix=CHECK-REMARKS
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: nested hardware-loops not supported
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: loop is not a candidate
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: nested hardware-loops not supported
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-REMARKS: remark: <unknown>:0:0: hardware-loop not created: it's not profitable to create a hardware-loop
; CHECK-LABEL: early_exit
; CHECK-NOT: llvm.set.loop.iterations
; CHECK-NOT: llvm.loop.decrement
define i32 @early_exit(i32* nocapture readonly %a, i32 %max, i32 %n) {
entry:
br label %do.body
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc, %if.end ]
%arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.0
%0 = load i32, i32* %arrayidx, align 4
%cmp = icmp sgt i32 %0, %max
br i1 %cmp, label %do.end, label %if.end
if.end:
%inc = add nuw i32 %i.0, 1
%cmp1 = icmp ult i32 %inc, %n
br i1 %cmp1, label %do.body, label %if.end.do.end_crit_edge
if.end.do.end_crit_edge:
%arrayidx2.phi.trans.insert = getelementptr inbounds i32, i32* %a, i32 %inc
%.pre = load i32, i32* %arrayidx2.phi.trans.insert, align 4
br label %do.end
do.end:
%1 = phi i32 [ %.pre, %if.end.do.end_crit_edge ], [ %0, %do.body ]
ret i32 %1
}
; CHECK-LABEL: nested
; CHECK-NOT: call i32 @llvm.start.loop.iterations.i32(i32 %N)
; CHECK: br i1 %cmp20, label %while.end7, label %while.cond1.preheader.us
; CHECK: [[START:%[^ ]+]] = call i32 @llvm.start.loop.iterations.i32(i32 %N)
; CHECK: br label %while.body3.us
; CHECK: [[REM:%[^ ]+]] = phi i32 [ [[START]], %while.cond1.preheader.us ], [ [[LOOP_DEC:%[^ ]+]], %while.body3.us ]
; CHECK: [[LOOP_DEC]] = call i32 @llvm.loop.decrement.reg.i32(i32 [[REM]], i32 1)
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %while.body3.us, label %while.cond1.while.end_crit_edge.us
; CHECK-NOT: %{{[^ ]+}} = call i1 @llvm.loop.decrement.i32(i32 1)
define void @nested(i32* nocapture %A, i32 %N) {
entry:
%cmp20 = icmp eq i32 %N, 0
br i1 %cmp20, label %while.end7, label %while.cond1.preheader.us
while.cond1.preheader.us:
%i.021.us = phi i32 [ %inc6.us, %while.cond1.while.end_crit_edge.us ], [ 0, %entry ]
%mul.us = mul i32 %i.021.us, %N
br label %while.body3.us
while.body3.us:
%j.019.us = phi i32 [ 0, %while.cond1.preheader.us ], [ %inc.us, %while.body3.us ]
%add.us = add i32 %j.019.us, %mul.us
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %add.us
store i32 %add.us, i32* %arrayidx.us, align 4
%inc.us = add nuw i32 %j.019.us, 1
%exitcond = icmp eq i32 %inc.us, %N
br i1 %exitcond, label %while.cond1.while.end_crit_edge.us, label %while.body3.us
while.cond1.while.end_crit_edge.us:
%inc6.us = add nuw i32 %i.021.us, 1
%exitcond23 = icmp eq i32 %inc6.us, %N
br i1 %exitcond23, label %while.end7, label %while.cond1.preheader.us
while.end7:
ret void
}
; CHECK-LABEL: pre_existing
; CHECK: llvm.start.loop.iterations
; CHECK-NOT: llvm.start.loop.iterations
; CHECK: call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
; CHECK-NOT: call i32 @llvm.loop.decrement.reg
define i32 @pre_existing(i32 %n, i32* nocapture %p, i32* nocapture readonly %q) {
entry:
%start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
br label %while.body
while.body: ; preds = %while.body, %entry
%q.addr.05 = phi i32* [ %incdec.ptr, %while.body ], [ %q, %entry ]
%p.addr.04 = phi i32* [ %incdec.ptr1, %while.body ], [ %p, %entry ]
%0 = phi i32 [ %start, %entry ], [ %2, %while.body ]
%incdec.ptr = getelementptr inbounds i32, i32* %q.addr.05, i32 1
%1 = load i32, i32* %q.addr.05, align 4
%incdec.ptr1 = getelementptr inbounds i32, i32* %p.addr.04, i32 1
store i32 %1, i32* %p.addr.04, align 4
%2 = call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
%3 = icmp ne i32 %2, 0
br i1 %3, label %while.body, label %while.end
while.end: ; preds = %while.body
ret i32 0
}
; CHECK-LABEL: pre_existing_test_set
; CHECK: call { i32, i1 } @llvm.test.start.loop.iterations
; CHECK-NOT: llvm.set{{.*}}.loop.iterations
; CHECK: call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
; CHECK-NOT: call i32 @llvm.loop.decrement.reg
define i32 @pre_existing_test_set(i32 %n, i32* nocapture %p, i32* nocapture readonly %q) {
entry:
%guard = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %n)
%g0 = extractvalue { i32, i1 } %guard, 0
%g1 = extractvalue { i32, i1 } %guard, 1
br i1 %g1, label %while.preheader, label %while.end
while.preheader:
br label %while.body
while.body: ; preds = %while.body, %entry
%q.addr.05 = phi i32* [ %incdec.ptr, %while.body ], [ %q, %while.preheader ]
%p.addr.04 = phi i32* [ %incdec.ptr1, %while.body ], [ %p, %while.preheader ]
%0 = phi i32 [ %g0, %while.preheader ], [ %2, %while.body ]
%incdec.ptr = getelementptr inbounds i32, i32* %q.addr.05, i32 1
%1 = load i32, i32* %q.addr.05, align 4
%incdec.ptr1 = getelementptr inbounds i32, i32* %p.addr.04, i32 1
store i32 %1, i32* %p.addr.04, align 4
%2 = call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
%3 = icmp ne i32 %2, 0
br i1 %3, label %while.body, label %while.end
while.end: ; preds = %while.body
ret i32 0
}
; CHECK-LABEL: pre_existing_inner
; CHECK-NOT: llvm.start.loop.iterations
; CHECK: while.cond1.preheader.us:
; CHECK: call i32 @llvm.start.loop.iterations.i32(i32 %N)
; CHECK: call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
; CHECK: br i1
; CHECK-NOT: call i32 @llvm.loop.decrement
define void @pre_existing_inner(i32* nocapture %A, i32 %N) {
entry:
%cmp20 = icmp eq i32 %N, 0
br i1 %cmp20, label %while.end7, label %while.cond1.preheader.us
while.cond1.preheader.us:
%i.021.us = phi i32 [ %inc6.us, %while.cond1.while.end_crit_edge.us ], [ 0, %entry ]
%mul.us = mul i32 %i.021.us, %N
%start = call i32 @llvm.start.loop.iterations.i32(i32 %N)
br label %while.body3.us
while.body3.us:
%j.019.us = phi i32 [ 0, %while.cond1.preheader.us ], [ %inc.us, %while.body3.us ]
%0 = phi i32 [ %start, %while.cond1.preheader.us ], [ %1, %while.body3.us ]
%add.us = add i32 %j.019.us, %mul.us
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %add.us
store i32 %add.us, i32* %arrayidx.us, align 4
%inc.us = add nuw i32 %j.019.us, 1
%1 = call i32 @llvm.loop.decrement.reg.i32(i32 %0, i32 1)
%2 = icmp ne i32 %1, 0
br i1 %2, label %while.body3.us, label %while.cond1.while.end_crit_edge.us
while.cond1.while.end_crit_edge.us:
%inc6.us = add nuw i32 %i.021.us, 1
%exitcond23 = icmp eq i32 %inc6.us, %N
br i1 %exitcond23, label %while.end7, label %while.cond1.preheader.us
while.end7:
ret void
}
; CHECK-LABEL: not_rotated
; CHECK-NOT: call i32 @llvm.start.loop.iterations
; CHECK-NOT: call i32 @llvm.loop.decrement.i32
define void @not_rotated(i32, i16* nocapture, i16 signext) {
br label %4
4:
%5 = phi i32 [ 0, %3 ], [ %19, %18 ]
%6 = icmp eq i32 %5, %0
br i1 %6, label %20, label %7
7:
%8 = mul i32 %5, %0
br label %9
9:
%10 = phi i32 [ %17, %12 ], [ 0, %7 ]
%11 = icmp eq i32 %10, %0
br i1 %11, label %18, label %12
12:
%13 = add i32 %10, %8
%14 = getelementptr inbounds i16, i16* %1, i32 %13
%15 = load i16, i16* %14, align 2
%16 = add i16 %15, %2
store i16 %16, i16* %14, align 2
%17 = add i32 %10, 1
br label %9
18:
%19 = add i32 %5, 1
br label %4
20:
ret void
}
; CHECK-LABEL: multi_latch
; CHECK-NOT: call i32 @llvm.start.loop.iterations
; CHECK-NOT: call i32 @llvm.loop.decrement
define void @multi_latch(i32* %a, i32* %b, i32 %N) {
entry:
%half = lshr i32 %N, 1
br label %header
header:
%iv = phi i32 [ 0, %entry ], [ %count.next, %latch.0 ], [ %count.next, %latch.1 ]
%cmp = icmp ult i32 %iv, %half
%addr.a = getelementptr i32, i32* %a, i32 %iv
%addr.b = getelementptr i32, i32* %b, i32 %iv
br i1 %cmp, label %if.then, label %if.else
if.then:
store i32 %iv, i32* %addr.a
br label %latch.0
if.else:
store i32 %iv, i32* %addr.b
br label %latch.0
latch.0:
%count.next = add nuw i32 %iv, 1
%cmp.1 = icmp ult i32 %count.next, %half
br i1 %cmp.1, label %header, label %latch.1
latch.1:
%ld = load i32, i32* %addr.a
store i32 %ld, i32* %addr.b
%cmp.2 = icmp ult i32 %count.next, %N
br i1 %cmp.2, label %header, label %latch.1
exit:
ret void
}
; CHECK-LABEL: search
; CHECK: entry:
; CHECK: [[TEST1:%[^ ]+]] = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %N)
; CHECK: [[TEST:%[^ ]+]] = extractvalue { i32, i1 } [[TEST1]], 1
; CHECK: br i1 [[TEST]], label %for.body.preheader, label %for.cond.cleanup
; CHECK: for.body.preheader:
; CHECK: br label %for.body
; CHECK: for.body:
; CHECK: for.inc:
; CHECK: [[LOOP_DEC:%[^ ]+]] = call i32 @llvm.loop.decrement.reg.i32(
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %for.body, label %for.cond.cleanup
define i32 @search(i8* nocapture readonly %c, i32 %N) {
entry:
%cmp11 = icmp eq i32 %N, 0
br i1 %cmp11, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
%found.0.lcssa = phi i32 [ 0, %entry ], [ %found.1, %for.inc ]
%spaces.0.lcssa = phi i32 [ 0, %entry ], [ %spaces.1, %for.inc ]
%sub = sub nsw i32 %found.0.lcssa, %spaces.0.lcssa
ret i32 %sub
for.body:
%i.014 = phi i32 [ %inc3, %for.inc ], [ 0, %entry ]
%spaces.013 = phi i32 [ %spaces.1, %for.inc ], [ 0, %entry ]
%found.012 = phi i32 [ %found.1, %for.inc ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i8, i8* %c, i32 %i.014
%0 = load i8, i8* %arrayidx, align 1
switch i8 %0, label %for.inc [
i8 108, label %sw.bb
i8 111, label %sw.bb
i8 112, label %sw.bb
i8 32, label %sw.bb1
]
sw.bb: ; preds = %for.body, %for.body, %for.body
%inc = add nsw i32 %found.012, 1
br label %for.inc
sw.bb1: ; preds = %for.body
%inc2 = add nsw i32 %spaces.013, 1
br label %for.inc
for.inc: ; preds = %sw.bb, %sw.bb1, %for.body
%found.1 = phi i32 [ %found.012, %for.body ], [ %found.012, %sw.bb1 ], [ %inc, %sw.bb ]
%spaces.1 = phi i32 [ %spaces.013, %for.body ], [ %inc2, %sw.bb1 ], [ %spaces.013, %sw.bb ]
%inc3 = add nuw i32 %i.014, 1
%exitcond = icmp eq i32 %inc3, %N
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: unroll_inc_int
; CHECK: call i32 @llvm.start.loop.iterations.i32(i32 %N)
; CHECK: call i32 @llvm.loop.decrement.reg.i32(
; CHECK-UNROLL-LABEL: unroll_inc_int
; CHECK-UNROLL: [[PREHEADER:.LBB[0-9_]+]]: @ %for.body.preheader
; CHECK-UNROLL-NOT: dls
; CHECK-UNROLL: [[LOOP:.LBB[0-9_]+]]: @ %for.body
; CHECK-UNROLL: le lr, [[LOOP]]
; CHECK-UNROLL: wls lr, r12, [[EXIT:.LBB[0-9_]+]]
; CHECK-UNROLL: [[EPIL:.LBB[0-9_]+]]:
; CHECK-UNROLL: le lr, [[EPIL]]
; CHECK-UNROLL-NEXT: [[EXIT]]
define void @unroll_inc_int(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp8 = icmp sgt i32 %N, 0
br i1 %cmp8, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.09 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.09
%0 = load i32, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %c, i32 %i.09
%1 = load i32, i32* %arrayidx1, align 4
%mul = mul nsw i32 %1, %0
%arrayidx2 = getelementptr inbounds i32, i32* %a, i32 %i.09
store i32 %mul, i32* %arrayidx2, align 4
%inc = add nuw nsw i32 %i.09, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: unroll_inc_unsigned
; CHECK: call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %N)
; CHECK: call i32 @llvm.loop.decrement.reg.i32(
; CHECK-UNROLL-LABEL: unroll_inc_unsigned
; CHECK-UNROLL: [[PREHEADER:.LBB[0-9_]+]]: @ %for.body.preheader
; CHECK-UNROLL-NOT: dls
; CHECK-UNROLL: [[LOOP:.LBB[0-9_]+]]: @ %for.body
; CHECK-UNROLL: le lr, [[LOOP]]
; CHECK-UNROLL: wls lr, r12, [[EPIL_EXIT:.LBB[0-9_]+]]
; CHECK-UNROLL: [[EPIL:.LBB[0-9_]+]]:
; CHECK-UNROLL: le lr, [[EPIL]]
; CHECK-UNROLL: [[EPIL_EXIT]]:
; CHECK-UNROLL: pop
define void @unroll_inc_unsigned(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp8 = icmp eq i32 %N, 0
br i1 %cmp8, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret void
for.body:
%i.09 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.09
%0 = load i32, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %c, i32 %i.09
%1 = load i32, i32* %arrayidx1, align 4
%mul = mul nsw i32 %1, %0
%arrayidx2 = getelementptr inbounds i32, i32* %a, i32 %i.09
store i32 %mul, i32* %arrayidx2, align 4
%inc = add nuw i32 %i.09, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: unroll_dec_int
; CHECK: call i32 @llvm.start.loop.iterations.i32(i32 %N)
; CHECK: call i32 @llvm.loop.decrement.reg.i32(
; CHECK-UNROLL-LABEL: unroll_dec_int:
; CHECK-UNROLL: wls lr, {{.*}}, [[PROLOGUE_EXIT:.LBB[0-9_]+]]
; CHECK-UNROLL-NEXT: [[PROLOGUE:.LBB[0-9_]+]]:
; CHECK-UNROLL: le lr, [[PROLOGUE]]
; CHECK-UNROLL-NEXT: [[PROLOGUE_EXIT:.LBB[0-9_]+]]:
; CHECK-UNROLL: [[BODY:.LBB[0-9_]+]]:
; CHECK-UNROLL: le lr, [[BODY]]
; CHECK-UNROLL-NOT: b
; CHECK-UNROLL: pop
define void @unroll_dec_int(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp8 = icmp sgt i32 %N, 0
br i1 %cmp8, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.09 = phi i32 [ %dec, %for.body ], [ %N, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.09
%0 = load i32, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %c, i32 %i.09
%1 = load i32, i32* %arrayidx1, align 4
%mul = mul nsw i32 %1, %0
%arrayidx2 = getelementptr inbounds i32, i32* %a, i32 %i.09
store i32 %mul, i32* %arrayidx2, align 4
%dec = add nsw i32 %i.09, -1
%cmp = icmp sgt i32 %dec, 0
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
declare i32 @llvm.start.loop.iterations.i32(i32) #0
declare { i32, i1 } @llvm.test.start.loop.iterations.i32(i32) #0
declare i32 @llvm.loop.decrement.reg.i32(i32, i32) #0