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llvm-project/llvm/test/Transforms/InstCombine/select-ctlz-to-cttz.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
declare i32 @llvm.cttz.i32(i32, i1 immarg)
declare i32 @llvm.ctlz.i32(i32, i1 immarg)
declare i64 @llvm.cttz.i64(i64, i1 immarg)
declare i64 @llvm.ctlz.i64(i64, i1 immarg)
declare <2 x i32> @llvm.ctlz.v2i32(<2 x i32>, i1)
declare <2 x i32> @llvm.cttz.v2i32(<2 x i32>, i1)
declare void @use(i32)
declare void @use2(i1)
define i32 @select_clz_to_ctz(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz(
; CHECK-NEXT: [[COND:%.*]] = call i32 @llvm.cttz.i32(i32 [[A:%.*]], i1 true), !range !0
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 0, %a
%and = and i32 %sub, %a
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
%tobool = icmp eq i32 %a, 0
%sub1 = xor i32 %lz, 31
%cond = select i1 %tobool, i32 %lz, i32 %sub1
ret i32 %cond
}
define i32 @select_clz_to_ctz_preserve_flag(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz_preserve_flag(
; CHECK-NEXT: [[COND:%.*]] = call i32 @llvm.cttz.i32(i32 [[A:%.*]], i1 false), !range !0
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 0, %a
%and = and i32 %sub, %a
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 false)
%tobool = icmp eq i32 %a, 0
%sub1 = xor i32 %lz, 31
%cond = select i1 %tobool, i32 %lz, i32 %sub1
ret i32 %cond
}
define <2 x i32> @select_clz_to_ctz_vec(<2 x i32> %a) {
; CHECK-LABEL: @select_clz_to_ctz_vec(
; CHECK-NEXT: [[COND:%.*]] = call <2 x i32> @llvm.cttz.v2i32(<2 x i32> [[A:%.*]], i1 true)
; CHECK-NEXT: ret <2 x i32> [[COND]]
;
%sub = sub <2 x i32> zeroinitializer, %a
%and = and <2 x i32> %sub, %a
%lz = tail call <2 x i32> @llvm.ctlz.v2i32(<2 x i32> %and, i1 true)
%tobool = icmp eq <2 x i32> %a, zeroinitializer
%sub1 = xor <2 x i32> %lz, <i32 31, i32 31>
%cond = select <2 x i1> %tobool, <2 x i32> %lz, <2 x i32> %sub1
ret <2 x i32> %cond
}
define i32 @select_clz_to_ctz_extra_use(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz_extra_use(
; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[AND]], i1 true), !range !0
; CHECK-NEXT: [[SUB1:%.*]] = xor i32 [[LZ]], 31
; CHECK-NEXT: call void @use(i32 [[SUB1]])
; CHECK-NEXT: [[COND:%.*]] = call i32 @llvm.cttz.i32(i32 [[A]], i1 true), !range !0
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 0, %a
%and = and i32 %sub, %a
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
%tobool = icmp eq i32 %a, 0
%sub1 = xor i32 %lz, 31
call void @use(i32 %sub1)
%cond = select i1 %tobool, i32 %lz, i32 %sub1
ret i32 %cond
}
define i32 @select_clz_to_ctz_and_commuted(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz_and_commuted(
; CHECK-NEXT: [[COND:%.*]] = call i32 @llvm.cttz.i32(i32 [[A:%.*]], i1 true), !range !0
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 0, %a
%and = and i32 %a, %sub
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
%tobool = icmp eq i32 %a, 0
%sub1 = xor i32 %lz, 31
%cond = select i1 %tobool, i32 %lz, i32 %sub1
ret i32 %cond
}
define i32 @select_clz_to_ctz_icmp_ne(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz_icmp_ne(
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp ne i32 [[A:%.*]], 0
; CHECK-NEXT: call void @use2(i1 [[TOBOOL]])
; CHECK-NEXT: [[COND:%.*]] = call i32 @llvm.cttz.i32(i32 [[A]], i1 true), !range !0
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 0, %a
%and = and i32 %sub, %a
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
%tobool = icmp ne i32 %a, 0
call void @use2(i1 %tobool)
%sub1 = xor i32 %lz, 31
%cond = select i1 %tobool, i32 %sub1, i32 %lz
ret i32 %cond
}
define i64 @select_clz_to_ctz_i64(i64 %a) {
; CHECK-LABEL: @select_clz_to_ctz_i64(
; CHECK-NEXT: [[COND:%.*]] = call i64 @llvm.cttz.i64(i64 [[A:%.*]], i1 true), !range !1
; CHECK-NEXT: ret i64 [[COND]]
;
%sub = sub i64 0, %a
%and = and i64 %sub, %a
%lz = tail call i64 @llvm.ctlz.i64(i64 %and, i1 true)
%tobool = icmp eq i64 %a, 0
%sub1 = xor i64 %lz, 63
%cond = select i1 %tobool, i64 %lz, i64 %sub1
ret i64 %cond
}
; Negative tests
define i32 @select_clz_to_ctz_wrong_sub(i32 %a) {
; CHECK-LABEL: @select_clz_to_ctz_wrong_sub(
; CHECK-NEXT: [[SUB:%.*]] = sub i32 1, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i32 [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[AND]], i1 true), !range !0
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[A]], 0
; CHECK-NEXT: [[SUB1:%.*]] = xor i32 [[LZ]], 31
; CHECK-NEXT: [[COND:%.*]] = select i1 [[TOBOOL]], i32 [[LZ]], i32 [[SUB1]]
; CHECK-NEXT: ret i32 [[COND]]
;
%sub = sub i32 1, %a
%and = and i32 %sub, %a
%lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
%tobool = icmp eq i32 %a, 0
%sub1 = xor i32 %lz, 31
%cond = select i1 %tobool, i32 %lz, i32 %sub1
ret i32 %cond
}
define i64 @select_clz_to_ctz_i64_wrong_xor(i64 %a) {
; CHECK-LABEL: @select_clz_to_ctz_i64_wrong_xor(
; CHECK-NEXT: [[SUB:%.*]] = sub i64 0, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i64 [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call i64 @llvm.ctlz.i64(i64 [[AND]], i1 true), !range !1
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i64 [[A]], 0
; CHECK-NEXT: [[SUB11:%.*]] = or i64 [[LZ]], 64
; CHECK-NEXT: [[COND:%.*]] = select i1 [[TOBOOL]], i64 [[LZ]], i64 [[SUB11]]
; CHECK-NEXT: ret i64 [[COND]]
;
%sub = sub i64 0, %a
%and = and i64 %sub, %a
%lz = tail call i64 @llvm.ctlz.i64(i64 %and, i1 true)
%tobool = icmp eq i64 %a, 0
%sub1 = xor i64 %lz, 64
%cond = select i1 %tobool, i64 %lz, i64 %sub1
ret i64 %cond
}
define i64 @select_clz_to_ctz_i64_wrong_icmp_cst(i64 %a) {
; CHECK-LABEL: @select_clz_to_ctz_i64_wrong_icmp_cst(
; CHECK-NEXT: [[SUB:%.*]] = sub i64 0, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i64 [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call i64 @llvm.ctlz.i64(i64 [[AND]], i1 true), !range !1
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i64 [[A]], 1
; CHECK-NEXT: [[SUB1:%.*]] = xor i64 [[LZ]], 63
; CHECK-NEXT: [[COND:%.*]] = select i1 [[TOBOOL]], i64 [[LZ]], i64 [[SUB1]]
; CHECK-NEXT: ret i64 [[COND]]
;
%sub = sub i64 0, %a
%and = and i64 %sub, %a
%lz = tail call i64 @llvm.ctlz.i64(i64 %and, i1 true)
%tobool = icmp eq i64 %a, 1
%sub1 = xor i64 %lz, 63
%cond = select i1 %tobool, i64 %lz, i64 %sub1
ret i64 %cond
}
define i64 @select_clz_to_ctz_i64_wrong_icmp_pred(i64 %a) {
; CHECK-LABEL: @select_clz_to_ctz_i64_wrong_icmp_pred(
; CHECK-NEXT: [[SUB:%.*]] = sub i64 0, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i64 [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call i64 @llvm.ctlz.i64(i64 [[AND]], i1 true), !range !1
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp slt i64 [[A]], 0
; CHECK-NEXT: [[SUB1:%.*]] = xor i64 [[LZ]], 63
; CHECK-NEXT: [[COND:%.*]] = select i1 [[TOBOOL]], i64 [[LZ]], i64 [[SUB1]]
; CHECK-NEXT: ret i64 [[COND]]
;
%sub = sub i64 0, %a
%and = and i64 %sub, %a
%lz = tail call i64 @llvm.ctlz.i64(i64 %and, i1 true)
%tobool = icmp slt i64 %a, 0
%sub1 = xor i64 %lz, 63
%cond = select i1 %tobool, i64 %lz, i64 %sub1
ret i64 %cond
}
define <2 x i32> @select_clz_to_ctz_vec_with_undef(<2 x i32> %a) {
; CHECK-LABEL: @select_clz_to_ctz_vec_with_undef(
; CHECK-NEXT: [[SUB:%.*]] = sub <2 x i32> zeroinitializer, [[A:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and <2 x i32> [[SUB]], [[A]]
; CHECK-NEXT: [[LZ:%.*]] = tail call <2 x i32> @llvm.ctlz.v2i32(<2 x i32> [[AND]], i1 true)
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq <2 x i32> [[A]], zeroinitializer
; CHECK-NEXT: [[SUB1:%.*]] = xor <2 x i32> [[LZ]], <i32 31, i32 undef>
; CHECK-NEXT: [[COND:%.*]] = select <2 x i1> [[TOBOOL]], <2 x i32> [[LZ]], <2 x i32> [[SUB1]]
; CHECK-NEXT: ret <2 x i32> [[COND]]
;
%sub = sub <2 x i32> zeroinitializer, %a
%and = and <2 x i32> %sub, %a
%lz = tail call <2 x i32> @llvm.ctlz.v2i32(<2 x i32> %and, i1 true)
%tobool = icmp eq <2 x i32> %a, zeroinitializer
%sub1 = xor <2 x i32> %lz, <i32 31, i32 undef>
%cond = select <2 x i1> %tobool, <2 x i32> %lz, <2 x i32> %sub1
ret <2 x i32> %cond
}
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