| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; This test makes sure that div instructions are properly eliminated. |
| |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| define i32 @test1(i32 %A) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: ret i32 %A |
| ; |
| %B = sdiv i32 %A, 1 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test2(i32 %A) { |
| ; => Shift |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: [[B:%.*]] = lshr i32 %A, 3 |
| ; CHECK-NEXT: ret i32 [[B]] |
| ; |
| %B = udiv i32 %A, 8 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test3(i32 %A) { |
| ; => 0, don't need to keep traps |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %B = sdiv i32 0, %A ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test4(i32 %A) { |
| ; 0-A |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NEXT: [[B:%.*]] = sub i32 0, %A |
| ; CHECK-NEXT: ret i32 [[B]] |
| ; |
| %B = sdiv i32 %A, -1 ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| define i32 @test5(i32 %A) { |
| ; CHECK-LABEL: @test5( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %B = udiv i32 %A, -16 ; <i32> [#uses=1] |
| %C = udiv i32 %B, -4 ; <i32> [#uses=1] |
| ret i32 %C |
| } |
| |
| define i1 @test6(i32 %A) { |
| ; CHECK-LABEL: @test6( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 %A, 123 |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %B = udiv i32 %A, 123 ; <i32> [#uses=1] |
| ; A < 123 |
| %C = icmp eq i32 %B, 0 ; <i1> [#uses=1] |
| ret i1 %C |
| } |
| |
| define i1 @test7(i32 %A) { |
| ; CHECK-LABEL: @test7( |
| ; CHECK-NEXT: [[A_OFF:%.*]] = add i32 %A, -20 |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A_OFF]], 10 |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %B = udiv i32 %A, 10 ; <i32> [#uses=1] |
| ; A >= 20 && A < 30 |
| %C = icmp eq i32 %B, 2 ; <i1> [#uses=1] |
| ret i1 %C |
| } |
| |
| define <2 x i1> @test7vec(<2 x i32> %A) { |
| ; CHECK-LABEL: @test7vec( |
| ; CHECK-NEXT: [[A_OFF:%.*]] = add <2 x i32> %A, <i32 -20, i32 -20> |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i32> [[A_OFF]], <i32 10, i32 10> |
| ; CHECK-NEXT: ret <2 x i1> [[TMP1]] |
| ; |
| %B = udiv <2 x i32> %A, <i32 10, i32 10> |
| %C = icmp eq <2 x i32> %B, <i32 2, i32 2> |
| ret <2 x i1> %C |
| } |
| |
| define i1 @test8(i8 %A) { |
| ; CHECK-LABEL: @test8( |
| ; CHECK-NEXT: [[C:%.*]] = icmp ugt i8 %A, -11 |
| ; CHECK-NEXT: ret i1 [[C]] |
| ; |
| %B = udiv i8 %A, 123 ; <i8> [#uses=1] |
| ; A >= 246 |
| %C = icmp eq i8 %B, 2 ; <i1> [#uses=1] |
| ret i1 %C |
| } |
| |
| define <2 x i1> @test8vec(<2 x i8> %A) { |
| ; CHECK-LABEL: @test8vec( |
| ; CHECK-NEXT: [[C:%.*]] = icmp ugt <2 x i8> %A, <i8 -11, i8 -11> |
| ; CHECK-NEXT: ret <2 x i1> [[C]] |
| ; |
| %B = udiv <2 x i8> %A, <i8 123, i8 123> |
| %C = icmp eq <2 x i8> %B, <i8 2, i8 2> |
| ret <2 x i1> %C |
| } |
| |
| define i1 @test9(i8 %A) { |
| ; CHECK-LABEL: @test9( |
| ; CHECK-NEXT: [[C:%.*]] = icmp ult i8 %A, -10 |
| ; CHECK-NEXT: ret i1 [[C]] |
| ; |
| %B = udiv i8 %A, 123 ; <i8> [#uses=1] |
| ; A < 246 |
| %C = icmp ne i8 %B, 2 ; <i1> [#uses=1] |
| ret i1 %C |
| } |
| |
| define <2 x i1> @test9vec(<2 x i8> %A) { |
| ; CHECK-LABEL: @test9vec( |
| ; CHECK-NEXT: [[C:%.*]] = icmp ult <2 x i8> %A, <i8 -10, i8 -10> |
| ; CHECK-NEXT: ret <2 x i1> [[C]] |
| ; |
| %B = udiv <2 x i8> %A, <i8 123, i8 123> |
| %C = icmp ne <2 x i8> %B, <i8 2, i8 2> |
| ret <2 x i1> %C |
| } |
| |
| define i32 @test10(i32 %X, i1 %C) { |
| ; CHECK-LABEL: @test10( |
| ; CHECK-NEXT: [[R_V:%.*]] = select i1 %C, i32 6, i32 3 |
| ; CHECK-NEXT: [[R:%.*]] = lshr i32 %X, [[R:%.*]].v |
| ; CHECK-NEXT: ret i32 [[R]] |
| ; |
| %V = select i1 %C, i32 64, i32 8 ; <i32> [#uses=1] |
| %R = udiv i32 %X, %V ; <i32> [#uses=1] |
| ret i32 %R |
| } |
| |
| define i32 @test11(i32 %X, i1 %C) { |
| ; CHECK-LABEL: @test11( |
| ; CHECK-NEXT: [[B_V:%.*]] = select i1 %C, i32 10, i32 5 |
| ; CHECK-NEXT: [[B:%.*]] = lshr i32 %X, [[B:%.*]].v |
| ; CHECK-NEXT: ret i32 [[B]] |
| ; |
| %A = select i1 %C, i32 1024, i32 32 ; <i32> [#uses=1] |
| %B = udiv i32 %X, %A ; <i32> [#uses=1] |
| ret i32 %B |
| } |
| |
| ; PR2328 |
| define i32 @test12(i32 %x) nounwind { |
| ; CHECK-LABEL: @test12( |
| ; CHECK-NEXT: ret i32 1 |
| ; |
| %tmp3 = udiv i32 %x, %x ; 1 |
| ret i32 %tmp3 |
| } |
| |
| define i32 @test13(i32 %x) nounwind { |
| ; CHECK-LABEL: @test13( |
| ; CHECK-NEXT: ret i32 1 |
| ; |
| %tmp3 = sdiv i32 %x, %x ; 1 |
| ret i32 %tmp3 |
| } |
| |
| define i32 @test14(i8 %x) nounwind { |
| ; CHECK-LABEL: @test14( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %zext = zext i8 %x to i32 |
| %div = udiv i32 %zext, 257 ; 0 |
| ret i32 %div |
| } |
| |
| ; PR9814 |
| define i32 @test15(i32 %a, i32 %b) nounwind { |
| ; CHECK-LABEL: @test15( |
| ; CHECK-NEXT: [[TMP1:%.*]] = add i32 %b, -2 |
| ; CHECK-NEXT: [[DIV2:%.*]] = lshr i32 %a, [[TMP1]] |
| ; CHECK-NEXT: ret i32 [[DIV2]] |
| ; |
| %shl = shl i32 1, %b |
| %div = lshr i32 %shl, 2 |
| %div2 = udiv i32 %a, %div |
| ret i32 %div2 |
| } |
| |
| define <2 x i64> @test16(<2 x i64> %x) nounwind { |
| ; CHECK-LABEL: @test16( |
| ; CHECK-NEXT: [[DIV:%.*]] = udiv <2 x i64> %x, <i64 192, i64 192> |
| ; CHECK-NEXT: ret <2 x i64> [[DIV]] |
| ; |
| %shr = lshr <2 x i64> %x, <i64 5, i64 5> |
| %div = udiv <2 x i64> %shr, <i64 6, i64 6> |
| ret <2 x i64> %div |
| } |
| |
| define <2 x i64> @test17(<2 x i64> %x) nounwind { |
| ; CHECK-LABEL: @test17( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i64> %x, <i64 -3, i64 -4> |
| ; CHECK-NEXT: ret <2 x i64> [[DIV]] |
| ; |
| %neg = sub nsw <2 x i64> zeroinitializer, %x |
| %div = sdiv <2 x i64> %neg, <i64 3, i64 4> |
| ret <2 x i64> %div |
| } |
| |
| define <2 x i64> @test18(<2 x i64> %x) nounwind { |
| ; CHECK-LABEL: @test18( |
| ; CHECK-NEXT: [[DIV:%.*]] = sub <2 x i64> zeroinitializer, %x |
| ; CHECK-NEXT: ret <2 x i64> [[DIV]] |
| ; |
| %div = sdiv <2 x i64> %x, <i64 -1, i64 -1> |
| ret <2 x i64> %div |
| } |
| |
| define i32 @test19(i32 %x) { |
| ; CHECK-LABEL: @test19( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 %x, 1 |
| ; CHECK-NEXT: [[A:%.*]] = zext i1 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[A]] |
| ; |
| %A = udiv i32 1, %x |
| ret i32 %A |
| } |
| |
| define <2 x i32> @test19vec(<2 x i32> %x) { |
| ; CHECK-LABEL: @test19vec( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i32> [[X:%.*]], <i32 1, i32 1> |
| ; CHECK-NEXT: [[A:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i32> |
| ; CHECK-NEXT: ret <2 x i32> [[A]] |
| ; |
| %A = udiv <2 x i32> <i32 1, i32 1>, %x |
| ret <2 x i32> %A |
| } |
| |
| define i32 @test20(i32 %x) { |
| ; CHECK-LABEL: @test20( |
| ; CHECK-NEXT: [[TMP1:%.*]] = add i32 %x, 1 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp ult i32 [[TMP1]], 3 |
| ; CHECK-NEXT: [[A:%.*]] = select i1 [[TMP2]], i32 %x, i32 0 |
| ; CHECK-NEXT: ret i32 [[A]] |
| ; |
| %A = sdiv i32 1, %x |
| ret i32 %A |
| } |
| |
| define <2 x i32> @test20vec(<2 x i32> %x) { |
| ; CHECK-LABEL: @test20vec( |
| ; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i32> [[X:%.*]], <i32 1, i32 1> |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp ult <2 x i32> [[TMP1]], <i32 3, i32 3> |
| ; CHECK-NEXT: [[A:%.*]] = select <2 x i1> [[TMP2]], <2 x i32> [[X]], <2 x i32> zeroinitializer |
| ; CHECK-NEXT: ret <2 x i32> [[A]] |
| ; |
| %A = sdiv <2 x i32> <i32 1, i32 1>, %x |
| ret <2 x i32> %A |
| } |
| |
| define i32 @test21(i32 %a) { |
| ; CHECK-LABEL: @test21( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 %a, 3 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %shl = shl nsw i32 %a, 2 |
| %div = sdiv i32 %shl, 12 |
| ret i32 %div |
| } |
| |
| define i32 @test22(i32 %a) { |
| ; CHECK-LABEL: @test22( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 %a, 4 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %mul = mul nsw i32 %a, 3 |
| %div = sdiv i32 %mul, 12 |
| ret i32 %div |
| } |
| |
| define i32 @test23(i32 %a) { |
| ; CHECK-LABEL: @test23( |
| ; CHECK-NEXT: [[DIV:%.*]] = udiv i32 %a, 3 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %shl = shl nuw i32 %a, 2 |
| %div = udiv i32 %shl, 12 |
| ret i32 %div |
| } |
| |
| define i32 @test24(i32 %a) { |
| ; CHECK-LABEL: @test24( |
| ; CHECK-NEXT: [[DIV:%.*]] = lshr i32 %a, 2 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %mul = mul nuw i32 %a, 3 |
| %div = udiv i32 %mul, 12 |
| ret i32 %div |
| } |
| |
| define i32 @test25(i32 %a) { |
| ; CHECK-LABEL: @test25( |
| ; CHECK-NEXT: [[DIV:%.*]] = shl nsw i32 %a, 1 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %shl = shl nsw i32 %a, 2 |
| %div = sdiv i32 %shl, 2 |
| ret i32 %div |
| } |
| |
| define i32 @test26(i32 %a) { |
| ; CHECK-LABEL: @test26( |
| ; CHECK-NEXT: [[DIV:%.*]] = shl nsw i32 %a, 2 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %mul = mul nsw i32 %a, 12 |
| %div = sdiv i32 %mul, 3 |
| ret i32 %div |
| } |
| |
| define i32 @test27(i32 %a) { |
| ; CHECK-LABEL: @test27( |
| ; CHECK-NEXT: [[DIV:%.*]] = shl nuw i32 %a, 1 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %shl = shl nuw i32 %a, 2 |
| %div = udiv i32 %shl, 2 |
| ret i32 %div |
| } |
| |
| define i32 @test28(i32 %a) { |
| ; CHECK-LABEL: @test28( |
| ; CHECK-NEXT: [[DIV:%.*]] = mul nuw i32 %a, 12 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %mul = mul nuw i32 %a, 36 |
| %div = udiv i32 %mul, 3 |
| ret i32 %div |
| } |
| |
| define i32 @test29(i32 %a) { |
| ; CHECK-LABEL: @test29( |
| ; CHECK-NEXT: [[MUL_LOBIT:%.*]] = and i32 %a, 1 |
| ; CHECK-NEXT: ret i32 [[MUL_LOBIT]] |
| ; |
| %mul = shl nsw i32 %a, 31 |
| %div = sdiv i32 %mul, -2147483648 |
| ret i32 %div |
| } |
| |
| define i32 @test30(i32 %a) { |
| ; CHECK-LABEL: @test30( |
| ; CHECK-NEXT: ret i32 %a |
| ; |
| %mul = shl nuw i32 %a, 31 |
| %div = udiv i32 %mul, -2147483648 |
| ret i32 %div |
| } |
| |
| define <2 x i32> @test31(<2 x i32> %x) { |
| ; CHECK-LABEL: @test31( |
| ; CHECK-NEXT: ret <2 x i32> zeroinitializer |
| ; |
| %shr = lshr <2 x i32> %x, <i32 31, i32 31> |
| %div = udiv <2 x i32> %shr, <i32 2147483647, i32 2147483647> |
| ret <2 x i32> %div |
| } |
| |
| define i32 @test32(i32 %a, i32 %b) { |
| ; CHECK-LABEL: @test32( |
| ; CHECK-NEXT: [[SHL:%.*]] = shl i32 2, %b |
| ; CHECK-NEXT: [[DIV:%.*]] = lshr i32 [[SHL]], 2 |
| ; CHECK-NEXT: [[DIV2:%.*]] = udiv i32 %a, [[DIV]] |
| ; CHECK-NEXT: ret i32 [[DIV2]] |
| ; |
| %shl = shl i32 2, %b |
| %div = lshr i32 %shl, 2 |
| %div2 = udiv i32 %a, %div |
| ret i32 %div2 |
| } |
| |
| define <2 x i64> @test33(<2 x i64> %x) nounwind { |
| ; CHECK-LABEL: @test33( |
| ; CHECK-NEXT: [[DIV:%.*]] = udiv exact <2 x i64> %x, <i64 192, i64 192> |
| ; CHECK-NEXT: ret <2 x i64> [[DIV]] |
| ; |
| %shr = lshr exact <2 x i64> %x, <i64 5, i64 5> |
| %div = udiv exact <2 x i64> %shr, <i64 6, i64 6> |
| ret <2 x i64> %div |
| } |
| |
| define <2 x i64> @test34(<2 x i64> %x) nounwind { |
| ; CHECK-LABEL: @test34( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv exact <2 x i64> %x, <i64 -3, i64 -4> |
| ; CHECK-NEXT: ret <2 x i64> [[DIV]] |
| ; |
| %neg = sub nsw <2 x i64> zeroinitializer, %x |
| %div = sdiv exact <2 x i64> %neg, <i64 3, i64 4> |
| ret <2 x i64> %div |
| } |
| |
| define i32 @test35(i32 %A) { |
| ; CHECK-LABEL: @test35( |
| ; CHECK-NEXT: [[AND:%.*]] = and i32 %A, 2147483647 |
| ; CHECK-NEXT: [[MUL:%.*]] = udiv exact i32 [[AND]], 2147483647 |
| ; CHECK-NEXT: ret i32 [[MUL]] |
| ; |
| %and = and i32 %A, 2147483647 |
| %mul = sdiv exact i32 %and, 2147483647 |
| ret i32 %mul |
| } |
| |
| define <2 x i32> @test35vec(<2 x i32> %A) { |
| ; CHECK-LABEL: @test35vec( |
| ; CHECK-NEXT: [[AND:%.*]] = and <2 x i32> [[A:%.*]], <i32 2147483647, i32 2147483647> |
| ; CHECK-NEXT: [[MUL:%.*]] = udiv exact <2 x i32> [[AND]], <i32 2147483647, i32 2147483647> |
| ; CHECK-NEXT: ret <2 x i32> [[MUL]] |
| ; |
| %and = and <2 x i32> %A, <i32 2147483647, i32 2147483647> |
| %mul = sdiv exact <2 x i32> %and, <i32 2147483647, i32 2147483647> |
| ret <2 x i32> %mul |
| } |
| |
| define i32 @test36(i32 %A) { |
| ; CHECK-LABEL: @test36( |
| ; CHECK-NEXT: [[AND:%.*]] = and i32 %A, 2147483647 |
| ; CHECK-NEXT: [[MUL:%.*]] = lshr exact i32 [[AND]], %A |
| ; CHECK-NEXT: ret i32 [[MUL]] |
| ; |
| %and = and i32 %A, 2147483647 |
| %shl = shl nsw i32 1, %A |
| %mul = sdiv exact i32 %and, %shl |
| ret i32 %mul |
| } |
| |
| define <2 x i32> @test36vec(<2 x i32> %A) { |
| ; CHECK-LABEL: @test36vec( |
| ; CHECK-NEXT: [[AND:%.*]] = and <2 x i32> [[A:%.*]], <i32 2147483647, i32 2147483647> |
| ; CHECK-NEXT: [[MUL:%.*]] = lshr exact <2 x i32> [[AND]], [[A]] |
| ; CHECK-NEXT: ret <2 x i32> [[MUL]] |
| ; |
| %and = and <2 x i32> %A, <i32 2147483647, i32 2147483647> |
| %shl = shl nsw <2 x i32> <i32 1, i32 1>, %A |
| %mul = sdiv exact <2 x i32> %and, %shl |
| ret <2 x i32> %mul |
| } |
| |
| define i32 @test37(i32* %b) { |
| ; CHECK-LABEL: @test37( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i32 0, i32* %b, align 4 |
| ; CHECK-NEXT: br i1 undef, label %lor.rhs, label %lor.end |
| ; CHECK: lor.rhs: |
| ; CHECK-NEXT: br label %lor.end |
| ; CHECK: lor.end: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| store i32 0, i32* %b, align 4 |
| %0 = load i32, i32* %b, align 4 |
| br i1 undef, label %lor.rhs, label %lor.end |
| |
| lor.rhs: ; preds = %entry |
| %mul = mul nsw i32 undef, %0 |
| br label %lor.end |
| |
| lor.end: ; preds = %lor.rhs, %entry |
| %t.0 = phi i32 [ %0, %entry ], [ %mul, %lor.rhs ] |
| %div = sdiv i32 %t.0, 2 |
| ret i32 %div |
| } |
| |
| ; We can perform the division in the smaller type. |
| |
| define i32 @shrink(i8 %x) { |
| ; CHECK-LABEL: @shrink( |
| ; CHECK-NEXT: [[TMP1:%.*]] = sdiv i8 %x, 127 |
| ; CHECK-NEXT: [[DIV:%.*]] = sext i8 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %conv = sext i8 %x to i32 |
| %div = sdiv i32 %conv, 127 |
| ret i32 %div |
| } |
| |
| ; Division in the smaller type can lead to more optimizations. |
| |
| define i32 @zap(i8 %x) { |
| ; CHECK-LABEL: @zap( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 %x, -128 |
| ; CHECK-NEXT: [[DIV:%.*]] = zext i1 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %conv = sext i8 %x to i32 |
| %div = sdiv i32 %conv, -128 |
| ret i32 %div |
| } |
| |
| ; Splat constant divisors should get the same folds. |
| |
| define <3 x i32> @shrink_vec(<3 x i8> %x) { |
| ; CHECK-LABEL: @shrink_vec( |
| ; CHECK-NEXT: [[TMP1:%.*]] = sdiv <3 x i8> %x, <i8 127, i8 127, i8 127> |
| ; CHECK-NEXT: [[DIV:%.*]] = sext <3 x i8> [[TMP1]] to <3 x i32> |
| ; CHECK-NEXT: ret <3 x i32> [[DIV]] |
| ; |
| %conv = sext <3 x i8> %x to <3 x i32> |
| %div = sdiv <3 x i32> %conv, <i32 127, i32 127, i32 127> |
| ret <3 x i32> %div |
| } |
| |
| define <2 x i32> @zap_vec(<2 x i8> %x) { |
| ; CHECK-LABEL: @zap_vec( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> %x, <i8 -128, i8 -128> |
| ; CHECK-NEXT: [[DIV:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i32> |
| ; CHECK-NEXT: ret <2 x i32> [[DIV]] |
| ; |
| %conv = sext <2 x i8> %x to <2 x i32> |
| %div = sdiv <2 x i32> %conv, <i32 -128, i32 -128> |
| ret <2 x i32> %div |
| } |
| |
| ; But we can't do this if the signed constant won't fit in the original type. |
| |
| define i32 @shrink_no(i8 %x) { |
| ; CHECK-LABEL: @shrink_no( |
| ; CHECK-NEXT: [[CONV:%.*]] = sext i8 %x to i32 |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[CONV]], 128 |
| ; CHECK-NEXT: ret i32 [[DIV]] |
| ; |
| %conv = sext i8 %x to i32 |
| %div = sdiv i32 %conv, 128 |
| ret i32 %div |
| } |
| |
| ; When the divisor is known larger than the quotient, |
| ; InstSimplify should kill it before InstCombine sees it. |
| |
| define i32 @shrink_no2(i8 %x) { |
| ; CHECK-LABEL: @shrink_no2( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %conv = sext i8 %x to i32 |
| %div = sdiv i32 %conv, -129 |
| ret i32 %div |
| } |
| |
| define i32 @shrink_no3(i16 %x) { |
| ; CHECK-LABEL: @shrink_no3( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %conv = sext i16 %x to i32 |
| %div = sdiv i32 %conv, 65535 |
| ret i32 %div |
| } |
| |
| ; This previously crashed when trying to simplify the zext/icmp this becomes. |
| define <2 x i8> @PR34841(<2 x i8> %x) { |
| ; CHECK-LABEL: @PR34841( |
| ; CHECK-NEXT: ret <2 x i8> zeroinitializer |
| ; |
| %neg = and <2 x i8> %x, <i8 2, i8 2> |
| %div = udiv <2 x i8> <i8 1, i8 1>, %neg |
| ret <2 x i8> %div |
| } |