296 lines
8.7 KiB
LLVM
296 lines
8.7 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i1 @test2(i1 %X, i1 %Y) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[A:%.*]] = and i1 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: ret i1 [[A]]
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;
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%a = and i1 %X, %Y
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%b = and i1 %a, %X
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ret i1 %b
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}
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define i1 @test2_logical(i1 %X, i1 %Y) {
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; CHECK-LABEL: @test2_logical(
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; CHECK-NEXT: [[A:%.*]] = and i1 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: ret i1 [[A]]
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;
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%a = select i1 %X, i1 %Y, i1 false
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%b = select i1 %a, i1 %X, i1 false
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ret i1 %b
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}
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define i32 @test3(i32 %X, i32 %Y) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[A:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: ret i32 [[A]]
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;
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%a = and i32 %X, %Y
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%b = and i32 %Y, %a
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ret i32 %b
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}
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define i1 @test7(i32 %i, i1 %b) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[I:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[B:%.*]]
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; CHECK-NEXT: ret i1 [[TMP2]]
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;
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%cmp1 = icmp slt i32 %i, 1
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%cmp2 = icmp sgt i32 %i, -1
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%and1 = and i1 %cmp1, %b
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%and2 = and i1 %and1, %cmp2
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ret i1 %and2
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}
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define i1 @test7_logical(i32 %i, i1 %b) {
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; CHECK-LABEL: @test7_logical(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[I:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[B:%.*]]
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; CHECK-NEXT: ret i1 [[TMP2]]
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;
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%cmp1 = icmp slt i32 %i, 1
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%cmp2 = icmp sgt i32 %i, -1
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%and1 = select i1 %cmp1, i1 %b, i1 false
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%and2 = select i1 %and1, i1 %cmp2, i1 false
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ret i1 %and2
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}
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define i1 @test8(i32 %i) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: [[I_OFF:%.*]] = add i32 [[I:%.*]], -1
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[I_OFF]], 13
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cmp1 = icmp ne i32 %i, 0
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%cmp2 = icmp ult i32 %i, 14
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%cond = and i1 %cmp1, %cmp2
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ret i1 %cond
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}
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define i1 @test8_logical(i32 %i) {
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; CHECK-LABEL: @test8_logical(
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; CHECK-NEXT: [[I_OFF:%.*]] = add i32 [[I:%.*]], -1
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[I_OFF]], 13
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cmp1 = icmp ne i32 %i, 0
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%cmp2 = icmp ult i32 %i, 14
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%cond = select i1 %cmp1, i1 %cmp2, i1 false
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ret i1 %cond
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}
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; FIXME: Vectors should fold too.
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define <2 x i1> @test8vec(<2 x i32> %i) {
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; CHECK-LABEL: @test8vec(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ne <2 x i32> [[I:%.*]], zeroinitializer
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ult <2 x i32> [[I]], <i32 14, i32 14>
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; CHECK-NEXT: [[COND:%.*]] = and <2 x i1> [[CMP1]], [[CMP2]]
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; CHECK-NEXT: ret <2 x i1> [[COND]]
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;
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%cmp1 = icmp ne <2 x i32> %i, zeroinitializer
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%cmp2 = icmp ult <2 x i32> %i, <i32 14, i32 14>
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%cond = and <2 x i1> %cmp1, %cmp2
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ret <2 x i1> %cond
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}
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; combine -x & 1 into x & 1
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define i64 @test9(i64 %x) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: [[AND:%.*]] = and i64 [[X:%.*]], 1
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; CHECK-NEXT: ret i64 [[AND]]
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;
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%sub = sub nsw i64 0, %x
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%and = and i64 %sub, 1
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ret i64 %and
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}
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; combine -x & 1 into x & 1
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define <2 x i64> @test9vec(<2 x i64> %x) {
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; CHECK-LABEL: @test9vec(
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; CHECK-NEXT: [[AND:%.*]] = and <2 x i64> [[X:%.*]], <i64 1, i64 1>
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; CHECK-NEXT: ret <2 x i64> [[AND]]
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;
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%sub = sub nsw <2 x i64> <i64 0, i64 0>, %x
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%and = and <2 x i64> %sub, <i64 1, i64 1>
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ret <2 x i64> %and
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}
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define i64 @test10(i64 %x) {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[TMP1:%.*]] = and i64 [[X:%.*]], -2
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; CHECK-NEXT: [[ADD:%.*]] = sub i64 0, [[TMP1]]
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; CHECK-NEXT: ret i64 [[ADD]]
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;
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%sub = sub nsw i64 0, %x
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%and = and i64 %sub, 1
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%add = add i64 %sub, %and
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ret i64 %add
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}
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; (1 << x) & 1 --> zext(x == 0)
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define i8 @and1_shl1_is_cmp_eq_0(i8 %x) {
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; CHECK-LABEL: @and1_shl1_is_cmp_eq_0(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: [[AND:%.*]] = zext i1 [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[AND]]
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;
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%sh = shl i8 1, %x
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%and = and i8 %sh, 1
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ret i8 %and
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}
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; Don't do it if the shift has another use.
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define i8 @and1_shl1_is_cmp_eq_0_multiuse(i8 %x) {
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; CHECK-LABEL: @and1_shl1_is_cmp_eq_0_multiuse(
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; CHECK-NEXT: [[SH:%.*]] = shl i8 1, [[X:%.*]]
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; CHECK-NEXT: [[AND:%.*]] = and i8 [[SH]], 1
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; CHECK-NEXT: [[ADD:%.*]] = add i8 [[SH]], [[AND]]
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; CHECK-NEXT: ret i8 [[ADD]]
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;
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%sh = shl i8 1, %x
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%and = and i8 %sh, 1
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%add = add i8 %sh, %and
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ret i8 %add
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}
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; (1 << x) & 1 --> zext(x == 0)
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define <2 x i8> @and1_shl1_is_cmp_eq_0_vec(<2 x i8> %x) {
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; CHECK-LABEL: @and1_shl1_is_cmp_eq_0_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[AND:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[AND]]
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;
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%sh = shl <2 x i8> <i8 1, i8 1>, %x
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%and = and <2 x i8> %sh, <i8 1, i8 1>
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ret <2 x i8> %and
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}
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define <2 x i8> @and1_shl1_is_cmp_eq_0_vec_undef(<2 x i8> %x) {
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; CHECK-LABEL: @and1_shl1_is_cmp_eq_0_vec_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[AND:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[AND]]
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;
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%sh = shl <2 x i8> <i8 1, i8 undef>, %x
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%and = and <2 x i8> %sh, <i8 1, i8 undef>
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ret <2 x i8> %and
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}
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; (1 >> x) & 1 --> zext(x == 0)
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define i8 @and1_lshr1_is_cmp_eq_0(i8 %x) {
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; CHECK-LABEL: @and1_lshr1_is_cmp_eq_0(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: [[AND:%.*]] = zext i1 [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[AND]]
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;
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%sh = lshr i8 1, %x
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%and = and i8 %sh, 1
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ret i8 %and
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}
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; Don't do it if the shift has another use.
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define i8 @and1_lshr1_is_cmp_eq_0_multiuse(i8 %x) {
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; CHECK-LABEL: @and1_lshr1_is_cmp_eq_0_multiuse(
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; CHECK-NEXT: [[SH:%.*]] = lshr i8 1, [[X:%.*]]
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; CHECK-NEXT: [[AND:%.*]] = and i8 [[SH]], 1
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; CHECK-NEXT: [[ADD:%.*]] = add nuw nsw i8 [[SH]], [[AND]]
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; CHECK-NEXT: ret i8 [[ADD]]
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;
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%sh = lshr i8 1, %x
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%and = and i8 %sh, 1
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%add = add i8 %sh, %and
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ret i8 %add
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}
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; (1 >> x) & 1 --> zext(x == 0)
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define <2 x i8> @and1_lshr1_is_cmp_eq_0_vec(<2 x i8> %x) {
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; CHECK-LABEL: @and1_lshr1_is_cmp_eq_0_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[AND:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[AND]]
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;
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%sh = lshr <2 x i8> <i8 1, i8 1>, %x
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%and = and <2 x i8> %sh, <i8 1, i8 1>
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ret <2 x i8> %and
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}
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define <2 x i8> @and1_lshr1_is_cmp_eq_0_vec_undef(<2 x i8> %x) {
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; CHECK-LABEL: @and1_lshr1_is_cmp_eq_0_vec_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[AND:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[AND]]
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;
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%sh = lshr <2 x i8> <i8 1, i8 undef>, %x
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%and = and <2 x i8> %sh, <i8 1, i8 undef>
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ret <2 x i8> %and
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}
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; The add in this test is unnecessary because the LSBs of the LHS are 0 and the 'and' only consumes bits from those LSBs. It doesn't matter what happens to the upper bits.
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define i32 @test11(i32 %a, i32 %b) {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[X:%.*]] = shl i32 [[A:%.*]], 8
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; CHECK-NEXT: [[Z:%.*]] = and i32 [[B:%.*]], 128
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; CHECK-NEXT: [[W:%.*]] = mul i32 [[Z]], [[X]]
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; CHECK-NEXT: ret i32 [[W]]
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;
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%x = shl i32 %a, 8
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%y = add i32 %x, %b
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%z = and i32 %y, 128
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%w = mul i32 %z, %x ; to keep the shift from being removed
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ret i32 %w
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}
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; The add in this test is unnecessary because the LSBs of the RHS are 0 and the 'and' only consumes bits from those LSBs. It doesn't matter what happens to the upper bits.
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define i32 @test12(i32 %a, i32 %b) {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[X:%.*]] = shl i32 [[A:%.*]], 8
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; CHECK-NEXT: [[Z:%.*]] = and i32 [[B:%.*]], 128
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; CHECK-NEXT: [[W:%.*]] = mul i32 [[Z]], [[X]]
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; CHECK-NEXT: ret i32 [[W]]
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;
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%x = shl i32 %a, 8
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%y = add i32 %b, %x
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%z = and i32 %y, 128
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%w = mul i32 %z, %x ; to keep the shift from being removed
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ret i32 %w
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}
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; The sub in this test is unnecessary because the LSBs of the RHS are 0 and the 'and' only consumes bits from those LSBs. It doesn't matter what happens to the upper bits.
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define i32 @test13(i32 %a, i32 %b) {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: [[X:%.*]] = shl i32 [[A:%.*]], 8
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; CHECK-NEXT: [[Z:%.*]] = and i32 [[B:%.*]], 128
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; CHECK-NEXT: [[W:%.*]] = mul i32 [[Z]], [[X]]
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; CHECK-NEXT: ret i32 [[W]]
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;
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%x = shl i32 %a, 8
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%y = sub i32 %b, %x
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%z = and i32 %y, 128
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%w = mul i32 %z, %x ; to keep the shift from being removed
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ret i32 %w
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}
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; The sub in this test cannot be removed because we need to keep the negation of %b. TODO: But we should be able to replace the LHS of it with a 0.
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define i32 @test14(i32 %a, i32 %b) {
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: [[X:%.*]] = shl i32 [[A:%.*]], 8
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; CHECK-NEXT: [[Y:%.*]] = sub i32 0, [[B:%.*]]
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; CHECK-NEXT: [[Z:%.*]] = and i32 [[Y]], 128
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; CHECK-NEXT: [[W:%.*]] = mul i32 [[Z]], [[X]]
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; CHECK-NEXT: ret i32 [[W]]
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;
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%x = shl i32 %a, 8
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%y = sub i32 %x, %b
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%z = and i32 %y, 128
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%w = mul i32 %z, %x ; to keep the shift from being removed
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ret i32 %w
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}
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