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|
; RUN: llc < %s -x86-early-ifcvt -stress-early-ifcvt | FileCheck %s
target triple = "x86_64-apple-macosx10.8.0"
; CHECK: mm2
define i32 @mm2(i32* nocapture %p, i32 %n) nounwind uwtable readonly ssp {
entry:
br label %do.body
; CHECK: do.body
; Loop body has no branches before the backedge.
; CHECK-NOT: LBB
do.body:
%max.0 = phi i32 [ 0, %entry ], [ %max.1, %do.cond ]
%min.0 = phi i32 [ 0, %entry ], [ %min.1, %do.cond ]
%n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %do.cond ]
%p.addr.0 = phi i32* [ %p, %entry ], [ %incdec.ptr, %do.cond ]
%incdec.ptr = getelementptr inbounds i32* %p.addr.0, i64 1
%0 = load i32* %p.addr.0, align 4
%cmp = icmp sgt i32 %0, %max.0
br i1 %cmp, label %do.cond, label %if.else
if.else:
%cmp1 = icmp slt i32 %0, %min.0
%.min.0 = select i1 %cmp1, i32 %0, i32 %min.0
br label %do.cond
do.cond:
%max.1 = phi i32 [ %0, %do.body ], [ %max.0, %if.else ]
%min.1 = phi i32 [ %min.0, %do.body ], [ %.min.0, %if.else ]
; CHECK: decl %esi
; CHECK: jne LBB
%dec = add i32 %n.addr.0, -1
%tobool = icmp eq i32 %dec, 0
br i1 %tobool, label %do.end, label %do.body
do.end:
%sub = sub nsw i32 %max.1, %min.1
ret i32 %sub
}
; CHECK: multipreds
; Deal with alternative tail predecessors
; CHECK-NOT: LBB
; CHECK: cmov
; CHECK-NOT: LBB
; CHECK: cmov
; CHECK-NOT: LBB
; CHECK: fprintf
define void @multipreds(i32 %sw) nounwind uwtable ssp {
entry:
switch i32 %sw, label %if.then29 [
i32 0, label %if.then37
i32 127, label %if.end41
]
if.then29:
br label %if.end41
if.then37:
br label %if.end41
if.end41:
%exit_status.0 = phi i32 [ 2, %if.then29 ], [ 0, %if.then37 ], [ 66, %entry ]
call void (...)* @fprintf(i32 %exit_status.0) nounwind
unreachable
}
declare void @fprintf(...) nounwind
; CHECK: BZ2_decompress
; This test case contains irreducible control flow, so MachineLoopInfo doesn't
; recognize the cycle in the CFG. This would confuse MachineTraceMetrics.
define void @BZ2_decompress(i8* %s) nounwind ssp {
entry:
switch i32 undef, label %sw.default [
i32 39, label %if.end.sw.bb2050_crit_edge
i32 36, label %sw.bb1788
i32 37, label %if.end.sw.bb1855_crit_edge
i32 40, label %sw.bb2409
i32 38, label %sw.bb1983
i32 44, label %if.end.sw.bb3058_crit_edge
]
if.end.sw.bb3058_crit_edge: ; preds = %entry
br label %save_state_and_return
if.end.sw.bb1855_crit_edge: ; preds = %entry
br label %save_state_and_return
if.end.sw.bb2050_crit_edge: ; preds = %entry
br label %sw.bb2050
sw.bb1788: ; preds = %entry
br label %save_state_and_return
sw.bb1983: ; preds = %entry
br i1 undef, label %save_state_and_return, label %if.then1990
if.then1990: ; preds = %sw.bb1983
br label %while.body2038
while.body2038: ; preds = %sw.bb2050, %if.then1990
%groupPos.8 = phi i32 [ 0, %if.then1990 ], [ %groupPos.9, %sw.bb2050 ]
br i1 undef, label %save_state_and_return, label %if.end2042
if.end2042: ; preds = %while.body2038
br i1 undef, label %if.end2048, label %while.end2104
if.end2048: ; preds = %if.end2042
%bsLive2054.pre = getelementptr inbounds i8* %s, i32 8
br label %sw.bb2050
sw.bb2050: ; preds = %if.end2048, %if.end.sw.bb2050_crit_edge
%groupPos.9 = phi i32 [ 0, %if.end.sw.bb2050_crit_edge ], [ %groupPos.8, %if.end2048 ]
%and2064 = and i32 undef, 1
br label %while.body2038
while.end2104: ; preds = %if.end2042
br i1 undef, label %save_state_and_return, label %if.end2117
if.end2117: ; preds = %while.end2104
br i1 undef, label %while.body2161.lr.ph, label %while.body2145.lr.ph
while.body2145.lr.ph: ; preds = %if.end2117
br label %save_state_and_return
while.body2161.lr.ph: ; preds = %if.end2117
br label %save_state_and_return
sw.bb2409: ; preds = %entry
br label %save_state_and_return
sw.default: ; preds = %entry
call void @BZ2_bz__AssertH__fail() nounwind
br label %save_state_and_return
save_state_and_return:
%groupPos.14 = phi i32 [ 0, %sw.default ], [ %groupPos.8, %while.body2038 ], [ %groupPos.8, %while.end2104 ], [ 0, %if.end.sw.bb3058_crit_edge ], [ 0, %if.end.sw.bb1855_crit_edge ], [ %groupPos.8, %while.body2161.lr.ph ], [ %groupPos.8, %while.body2145.lr.ph ], [ 0, %sw.bb2409 ], [ 0, %sw.bb1788 ], [ 0, %sw.bb1983 ]
store i32 %groupPos.14, i32* undef, align 4
ret void
}
declare void @BZ2_bz__AssertH__fail()
; Make sure we don't speculate on div/idiv instructions
; CHECK: test_idiv
; CHECK-NOT: cmov
define i32 @test_idiv(i32 %a, i32 %b) nounwind uwtable readnone ssp {
%1 = icmp eq i32 %b, 0
br i1 %1, label %4, label %2
; <label>:2 ; preds = %0
%3 = sdiv i32 %a, %b
br label %4
; <label>:4 ; preds = %0, %2
%5 = phi i32 [ %3, %2 ], [ %a, %0 ]
ret i32 %5
}
; CHECK: test_div
; CHECK-NOT: cmov
define i32 @test_div(i32 %a, i32 %b) nounwind uwtable readnone ssp {
%1 = icmp eq i32 %b, 0
br i1 %1, label %4, label %2
; <label>:2 ; preds = %0
%3 = udiv i32 %a, %b
br label %4
; <label>:4 ; preds = %0, %2
%5 = phi i32 [ %3, %2 ], [ %a, %0 ]
ret i32 %5
}
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