| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s |
| |
| ; This tests the BuildREMEqFold optimization with UREM, i32, odd divisor, SETEQ. |
| ; The corresponding pseudocode is: |
| ; Q <- [N * multInv(5, 2^32)] <=> [N * 0xCCCCCCCD] <=> [N * (-858993459)] |
| ; res <- [Q <= (2^32 - 1) / 5] <=> [Q <= 858993459] <=> [Q < 858993460] |
| define i32 @test_urem_odd(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_odd: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w8, #52429 |
| ; CHECK-NEXT: movk w8, #52428, lsl #16 |
| ; CHECK-NEXT: umull x8, w0, w8 |
| ; CHECK-NEXT: lsr x8, x8, #34 |
| ; CHECK-NEXT: add w8, w8, w8, lsl #2 |
| ; CHECK-NEXT: cmp w0, w8 |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 5 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; This is like test_urem_odd, except the divisor has bit 30 set. |
| define i32 @test_urem_odd_bit30(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_odd_bit30: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w8, #-11 |
| ; CHECK-NEXT: umull x8, w0, w8 |
| ; CHECK-NEXT: mov w9, #3 |
| ; CHECK-NEXT: lsr x8, x8, #62 |
| ; CHECK-NEXT: movk w9, #16384, lsl #16 |
| ; CHECK-NEXT: msub w8, w8, w9, w0 |
| ; CHECK-NEXT: cmp w8, #0 // =0 |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 1073741827 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; This is like test_urem_odd, except the divisor has bit 31 set. |
| define i32 @test_urem_odd_bit31(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_odd_bit31: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w8, w0 |
| ; CHECK-NEXT: lsl x9, x8, #30 |
| ; CHECK-NEXT: sub x8, x9, x8 |
| ; CHECK-NEXT: lsr x8, x8, #61 |
| ; CHECK-NEXT: mov w9, #-2147483645 |
| ; CHECK-NEXT: msub w8, w8, w9, w0 |
| ; CHECK-NEXT: cmp w8, #0 // =0 |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 2147483651 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; This tests the BuildREMEqFold optimization with UREM, i16, even divisor, SETNE. |
| ; In this case, D <=> 14 <=> 7 * 2^1, so D0 = 7 and K = 1. |
| ; The corresponding pseudocode is: |
| ; Q <- [N * multInv(D0, 2^16)] <=> [N * multInv(7, 2^16)] <=> [N * 28087] |
| ; Q <- [Q >>rot K] <=> [Q >>rot 1] |
| ; res <- ![Q <= (2^16 - 1) / 7] <=> ![Q <= 9362] <=> [Q > 9362] |
| define i16 @test_urem_even(i16 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_even: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w10, #9363 |
| ; CHECK-NEXT: ubfx w9, w0, #1, #15 |
| ; CHECK-NEXT: movk w10, #37449, lsl #16 |
| ; CHECK-NEXT: umull x9, w9, w10 |
| ; CHECK-NEXT: and w8, w0, #0xffff |
| ; CHECK-NEXT: lsr x9, x9, #34 |
| ; CHECK-NEXT: mov w10, #14 |
| ; CHECK-NEXT: msub w8, w9, w10, w8 |
| ; CHECK-NEXT: cmp w8, #0 // =0 |
| ; CHECK-NEXT: cset w0, ne |
| ; CHECK-NEXT: ret |
| %urem = urem i16 %X, 14 |
| %cmp = icmp ne i16 %urem, 0 |
| %ret = zext i1 %cmp to i16 |
| ret i16 %ret |
| } |
| |
| ; This is like test_urem_even, except the divisor has bit 30 set. |
| define i32 @test_urem_even_bit30(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_even_bit30: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w8, #-415 |
| ; CHECK-NEXT: umull x8, w0, w8 |
| ; CHECK-NEXT: mov w9, #104 |
| ; CHECK-NEXT: lsr x8, x8, #62 |
| ; CHECK-NEXT: movk w9, #16384, lsl #16 |
| ; CHECK-NEXT: msub w8, w8, w9, w0 |
| ; CHECK-NEXT: cmp w8, #0 // =0 |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 1073741928 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; This is like test_urem_odd, except the divisor has bit 31 set. |
| define i32 @test_urem_even_bit31(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_even_bit31: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w8, #65435 |
| ; CHECK-NEXT: movk w8, #32767, lsl #16 |
| ; CHECK-NEXT: umull x8, w0, w8 |
| ; CHECK-NEXT: mov w9, #102 |
| ; CHECK-NEXT: lsr x8, x8, #62 |
| ; CHECK-NEXT: movk w9, #32768, lsl #16 |
| ; CHECK-NEXT: msub w8, w8, w9, w0 |
| ; CHECK-NEXT: cmp w8, #0 // =0 |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 2147483750 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; We should not proceed with this fold if the divisor is 1 or -1 |
| define i32 @test_urem_one(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_one: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: mov w0, #1 |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 1 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |
| |
| ; We can lower remainder of division by powers of two much better elsewhere; |
| ; also, BuildREMEqFold does not work when the only odd factor of the divisor is 1. |
| ; This ensures we don't touch powers of two. |
| define i32 @test_urem_pow2(i32 %X) nounwind readnone { |
| ; CHECK-LABEL: test_urem_pow2: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: tst w0, #0xf |
| ; CHECK-NEXT: cset w0, eq |
| ; CHECK-NEXT: ret |
| %urem = urem i32 %X, 16 |
| %cmp = icmp eq i32 %urem, 0 |
| %ret = zext i1 %cmp to i32 |
| ret i32 %ret |
| } |