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llvm-mirror/test/Transforms/SimplifyCFG/wc-widen-block.ll
Philip Reames 01f52927e7 Broaden the definition of a "widenable branch" 
As a reminder, a "widenable branch" is the pattern "br i1 (and i1 X, WC()), label %taken, label %untaken" where "WC" is the widenable condition intrinsics. The semantics of such a branch (derived from the semantics of WC) is that a new condition can be added into the condition arbitrarily without violating legality.

Broaden the definition in two ways:
    Allow swapped operands to the br (and X, WC()) form
    Allow widenable branch w/trivial condition (i.e. true) which takes form of br i1 WC()

The former is just general robustness (e.g. for X = non-instruction this is what instcombine produces). The later is specifically important as partial unswitching of a widenable range check produces exactly this form above the loop.

Differential Revision: https://reviews.llvm.org/D70502
2019-11-21 10:46:16 -08:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=simplify-cfg -S < %s | FileCheck %s
define i32 @basic(i1 %cond_0, i32* %p) {
; CHECK-LABEL: @basic(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[RETURN:%.*]], label [[DEOPT]], !prof !0
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%v = load i32, i32* %p
%cond_1 = icmp eq i32 %v, 0
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @mergeable(i1 %cond_0, i1 %cond_1) {
; CHECK-LABEL: @mergeable(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND_NOT:%.*]] = xor i1 [[EXIPLICIT_GUARD_COND]], true
; CHECK-NEXT: [[COND_1_NOT:%.*]] = xor i1 [[COND_1:%.*]], true
; CHECK-NEXT: [[BRMERGE:%.*]] = or i1 [[EXIPLICIT_GUARD_COND_NOT]], [[COND_1_NOT]]
; CHECK-NEXT: br i1 [[BRMERGE]], label [[DEOPT:%.*]], label [[RETURN:%.*]], !prof !1
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @basic_swapped_branch(i1 %cond_0, i32* %p) {
; CHECK-LABEL: @basic_swapped_branch(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[DEOPT]], label [[RETURN:%.*]], !prof !0
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%v = load i32, i32* %p
%cond_1 = icmp eq i32 %v, 0
br i1 %cond_1, label %deopt2, label %return, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @todo_sink_side_effect(i1 %cond_0, i1 %cond_1) {
; CHECK-LABEL: @todo_sink_side_effect(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: br i1 [[COND_1:%.*]], label [[RETURN:%.*]], label [[DEOPT2:%.*]], !prof !0
; CHECK: deopt2:
; CHECK-NEXT: [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET2]]
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
call void @unknown()
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @neg_unsinkable_side_effect(i1 %cond_0) {
; CHECK-LABEL: @neg_unsinkable_side_effect(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[V:%.*]] = call i32 @unknown_i32()
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[RETURN:%.*]], label [[DEOPT2:%.*]], !prof !0
; CHECK: deopt2:
; CHECK-NEXT: [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET2]]
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%v = call i32 @unknown_i32()
%cond_1 = icmp eq i32 %v, 0
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @neg_inf_loop(i1 %cond_0, i1 %cond_1) {
; CHECK-LABEL: @neg_inf_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: br i1 [[COND_1:%.*]], label [[RETURN:%.*]], label [[DEOPT]], !prof !0
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
call void @unknown()
br i1 %cond_1, label %return, label %deopt, !prof !0
return:
ret i32 0
}
define i32 @todo_phi(i1 %cond_0, i1 %cond_1) {
; CHECK-LABEL: @todo_phi(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[PHI]]) ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: br i1 [[COND_1:%.*]], label [[RETURN:%.*]], label [[DEOPT2:%.*]], !prof !0
; CHECK: deopt2:
; CHECK-NEXT: [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET2]]
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%phi = phi i32 [0, %entry]
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %phi) ]
ret i32 %deoptret
guarded:
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @neg_loop(i1 %cond_0, i1 %cond_1) {
; CHECK-LABEL: @neg_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[GUARDED:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: call void @unknown()
; CHECK-NEXT: br i1 [[COND_1:%.*]], label [[LOOP:%.*]], label [[DEOPT2:%.*]], !prof !0
; CHECK: deopt2:
; CHECK-NEXT: [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET2]]
;
entry:
br label %guarded
loop:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
call void @unknown()
br i1 %cond_1, label %loop, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
}
; This one is subtle - We can't widen only one branch use of the
; widenable condition as two branches are correlated. We'd have to
; widen them *both*.
define i32 @neg_correlated(i1 %cond_0, i1 %cond_1, i32* %p) {
; CHECK-LABEL: @neg_correlated(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND2:%.*]] = and i1 [[COND_1:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND2]], label [[GUARDED2:%.*]], label [[DEOPT2:%.*]], !prof !0
; CHECK: deopt2:
; CHECK-NEXT: [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET2]]
; CHECK: guarded2:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[COND_2:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_2]], label [[RETURN:%.*]], label [[DEOPT3:%.*]], !prof !0
; CHECK: deopt3:
; CHECK-NEXT: [[DEOPTRET3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET3]]
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%exiplicit_guard_cond2 = and i1 %cond_1, %widenable_cond
br i1 %exiplicit_guard_cond2, label %guarded2, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
guarded2:
%v = load i32, i32* %p
%cond_2 = icmp eq i32 %v, 0
br i1 %cond_2, label %return, label %deopt3, !prof !0
deopt3:
%deoptret3 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret3
return:
ret i32 0
}
define i32 @trivial_wb(i1 %cond_0, i32* %p) {
; CHECK-LABEL: @trivial_wb(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: br i1 [[WIDENABLE_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[RETURN:%.*]], label [[DEOPT]], !prof !0
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
br i1 %widenable_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%v = load i32, i32* %p
%cond_1 = icmp eq i32 %v, 0
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
define i32 @swapped_wb(i1 %cond_0, i32* %p) {
; CHECK-LABEL: @swapped_wb(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[WIDENABLE_COND]], [[COND_0:%.*]]
; CHECK-NEXT: br i1 [[EXIPLICIT_GUARD_COND]], label [[GUARDED:%.*]], label [[DEOPT:%.*]], !prof !0
; CHECK: deopt:
; CHECK-NEXT: [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT: ret i32 [[DEOPTRET]]
; CHECK: guarded:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i32 [[V]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[RETURN:%.*]], label [[DEOPT]], !prof !0
; CHECK: return:
; CHECK-NEXT: ret i32 0
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %widenable_cond, %cond_0
br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
deopt:
%deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret
guarded:
%v = load i32, i32* %p
%cond_1 = icmp eq i32 %v, 0
br i1 %cond_1, label %return, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
ret i32 %deoptret2
return:
ret i32 0
}
declare void @unknown()
declare i32 @unknown_i32()
declare i1 @llvm.experimental.widenable.condition()
declare i32 @llvm.experimental.deoptimize.i32(...)
!0 = !{!"branch_weights", i32 1048576, i32 1}
!1 = !{i32 1, i32 -2147483648}
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