known-non-zero.ll
5.01 KB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i64 @test0(i64 %x) {
; CHECK-LABEL: @test0(
; CHECK-NEXT: start:
; CHECK-NEXT: [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: br i1 false, label [[UNREACHABLE:%.*]], label [[EXIT]]
; CHECK: unreachable:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[C:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ 1, [[NON_ZERO]] ], [ 2, [[UNREACHABLE]] ]
; CHECK-NEXT: ret i64 [[C]]
;
start:
%a = icmp eq i64 %x, 0
br i1 %a, label %exit, label %non_zero
non_zero:
%b = icmp eq i64 %x, 0
br i1 %b, label %unreachable, label %exit
unreachable:
br label %exit
exit:
%c = phi i64 [ 0, %start ], [ 1, %non_zero ], [ 2, %unreachable ]
ret i64 %c
}
define i64 @test1(i64 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: start:
; CHECK-NEXT: [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: br i1 true, label [[EXIT]], label [[UNREACHABLE:%.*]]
; CHECK: unreachable:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[C:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ [[X]], [[NON_ZERO]] ], [ 0, [[UNREACHABLE]] ]
; CHECK-NEXT: ret i64 [[C]]
;
start:
%a = icmp eq i64 %x, 0
br i1 %a, label %exit, label %non_zero
non_zero:
%b = icmp ugt i64 %x, 0
br i1 %b, label %exit, label %unreachable
unreachable:
br label %exit
exit:
%c = phi i64 [ 0, %start ], [ %x, %non_zero ], [ 0, %unreachable ]
ret i64 %c
}
define i1 @test2(i64 %x, i1 %y) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: start:
; CHECK-NEXT: [[A:%.*]] = icmp eq i64 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[A]], label [[EXIT:%.*]], label [[NON_ZERO:%.*]]
; CHECK: non_zero:
; CHECK-NEXT: br i1 [[Y:%.*]], label [[ONE:%.*]], label [[TWO:%.*]]
; CHECK: one:
; CHECK-NEXT: br label [[MAINBLOCK:%.*]]
; CHECK: two:
; CHECK-NEXT: br label [[MAINBLOCK]]
; CHECK: mainblock:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi i1 [ false, [[MAINBLOCK]] ], [ true, [[START:%.*]] ]
; CHECK-NEXT: ret i1 [[RES]]
;
start:
%a = icmp eq i64 %x, 0
br i1 %a, label %exit, label %non_zero
non_zero:
br i1 %y, label %one, label %two
one:
br label %mainblock
two:
br label %mainblock
mainblock:
%p = phi i64 [ %x, %one ], [ 42, %two ]
%cmp = icmp eq i64 %p, 0
br label %exit
exit:
%res = phi i1 [ %cmp, %mainblock ], [ 1, %start ]
ret i1 %res
}
; The code below exposed a bug similar to the one exposed by D60846, see the commit 6ea477590085.
; In a nutshell, we should not replace %result.0 with 0 here.
define zeroext i8 @update_phi_query_loc_in_recursive_call(i8* nocapture readonly %p){
; CHECK-LABEL: @update_phi_query_loc_in_recursive_call(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[RESULT_0:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[CONV2:%.*]], [[FOR_BODY:%.*]] ]
; CHECK-NEXT: [[SHIFT_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ 1, [[FOR_BODY]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[SHIFT_0]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret i8 [[RESULT_0]]
; CHECK: for.body:
; CHECK-NEXT: [[TMP0:%.*]] = load i8, i8* [[P:%.*]], align 1
; CHECK-NEXT: [[CONV:%.*]] = zext i8 [[TMP0]] to i32
; CHECK-NEXT: [[MUL:%.*]] = shl nuw nsw i32 [[SHIFT_0]], 3
; CHECK-NEXT: [[SHL:%.*]] = shl nuw nsw i32 [[CONV]], [[MUL]]
; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHL]] to i8
; CHECK-NEXT: [[CONV2]] = or i8 [[RESULT_0]], [[TMP1]]
; CHECK-NEXT: br label [[FOR_COND]]
;
entry:
br label %for.cond
for.cond: ; preds = %for.body, %entry
%result.0 = phi i8 [ 0, %entry ], [ %conv2, %for.body ]
%shift.0 = phi i32 [ 0, %entry ], [ 1, %for.body ]
%cmp = icmp eq i32 %shift.0, 0
br i1 %cmp, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond
ret i8 %result.0
for.body: ; preds = %for.cond
%0 = load i8, i8* %p, align 1
%conv = zext i8 %0 to i32
%mul = shl nuw nsw i32 %shift.0, 3
%shl = shl nuw nsw i32 %conv, %mul
%1 = trunc i32 %shl to i8
%conv2 = or i8 %result.0, %1
%inc = add nuw nsw i32 %shift.0, 1
br label %for.cond
}
define i1 @freeze_nonzero(i8 %x, i8 %mask) {
; CHECK-LABEL: @freeze_nonzero(
; CHECK-NEXT: [[Y:%.*]] = or i8 [[X:%.*]], [[MASK:%.*]]
; CHECK-NEXT: [[C:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT: br i1 [[C]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: ret i1 false
; CHECK: B:
; CHECK-NEXT: ret i1 false
;
%y = or i8 %x, %mask
%c = icmp ne i8 %y, 0
br i1 %c, label %A, label %B
A:
%fr = freeze i8 %y
%c2 = icmp eq i8 %fr, 0
ret i1 %c2
B:
ret i1 0
}