llvm-project/llvm/test/CodeGen/AArch64/urem-seteq-optsize.ll

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
define i32 @test_minsize(i32 %X) optsize minsize nounwind readnone {
; CHECK-LABEL: test_minsize:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #5
; CHECK-NEXT: udiv w8, w0, w8
; CHECK-NEXT: add w8, w8, w8, lsl #2
; CHECK-NEXT: mov w9, #-10
; CHECK-NEXT: cmp w0, w8
; CHECK-NEXT: mov w8, #42
; CHECK-NEXT: csel w0, w8, w9, eq
; CHECK-NEXT: ret
%rem = urem i32 %X, 5
%cmp = icmp eq i32 %rem, 0
%ret = select i1 %cmp, i32 42, i32 -10
ret i32 %ret
}
define i32 @test_optsize(i32 %X) optsize nounwind readnone {
; CHECK-LABEL: test_optsize:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #52429
; CHECK-NEXT: movk w8, #52428, lsl #16
[CodeGen] [SelectionDAG] More efficient code for X % C == 0 (UREM case) (try 3) Summary: I'm submitting a new revision since i don't understand how to reclaim/reopen/take over the existing one, D50222. There is no such action in "Add Action" menu... This implements an optimization described in Hacker's Delight 10-17: when `C` is constant, the result of `X % C == 0` can be computed more cheaply without actually calculating the remainder. The motivation is discussed here: https://bugs.llvm.org/show_bug.cgi?id=35479. This is a recommit, the original commit rL364563 was reverted in rL364568 because test-suite detected miscompile - the new comparison constant 'Q' was being computed incorrectly (we divided by `D0` instead of `D`). Original patch D50222 by @hermord (Dmytro Shynkevych) Notes: - In principle, it's possible to also handle the `X % C1 == C2` case, as discussed on bugzilla. This seems to require an extra branch on overflow, so I refrained from implementing this for now. - An explicit check for when the `REM` can be reduced to just its LHS is included: the `X % C` == 0 optimization breaks `test1` in `test/CodeGen/X86/jump_sign.ll` otherwise. I hadn't managed to find a better way to not generate worse output in this case. - The `test/CodeGen/X86/jump_sign.ll` regresses, and is being fixed by a followup patch D63390. Reviewers: RKSimon, craig.topper, spatel, hermord, xbolva00 Reviewed By: RKSimon, xbolva00 Subscribers: dexonsmith, kristina, xbolva00, javed.absar, llvm-commits, hermord Tags: #llvm Differential Revision: https://reviews.llvm.org/D63391 llvm-svn: 364600
2019-06-28 05:52:10 +08:00
; CHECK-NEXT: mov w9, #13108
; CHECK-NEXT: movk w9, #13107, lsl #16
; CHECK-NEXT: mul w8, w0, w8
; CHECK-NEXT: mov w10, #-10
; CHECK-NEXT: cmp w8, w9
; CHECK-NEXT: mov w8, #42
[CodeGen] [SelectionDAG] More efficient code for X % C == 0 (UREM case) (try 3) Summary: I'm submitting a new revision since i don't understand how to reclaim/reopen/take over the existing one, D50222. There is no such action in "Add Action" menu... This implements an optimization described in Hacker's Delight 10-17: when `C` is constant, the result of `X % C == 0` can be computed more cheaply without actually calculating the remainder. The motivation is discussed here: https://bugs.llvm.org/show_bug.cgi?id=35479. This is a recommit, the original commit rL364563 was reverted in rL364568 because test-suite detected miscompile - the new comparison constant 'Q' was being computed incorrectly (we divided by `D0` instead of `D`). Original patch D50222 by @hermord (Dmytro Shynkevych) Notes: - In principle, it's possible to also handle the `X % C1 == C2` case, as discussed on bugzilla. This seems to require an extra branch on overflow, so I refrained from implementing this for now. - An explicit check for when the `REM` can be reduced to just its LHS is included: the `X % C` == 0 optimization breaks `test1` in `test/CodeGen/X86/jump_sign.ll` otherwise. I hadn't managed to find a better way to not generate worse output in this case. - The `test/CodeGen/X86/jump_sign.ll` regresses, and is being fixed by a followup patch D63390. Reviewers: RKSimon, craig.topper, spatel, hermord, xbolva00 Reviewed By: RKSimon, xbolva00 Subscribers: dexonsmith, kristina, xbolva00, javed.absar, llvm-commits, hermord Tags: #llvm Differential Revision: https://reviews.llvm.org/D63391 llvm-svn: 364600
2019-06-28 05:52:10 +08:00
; CHECK-NEXT: csel w0, w8, w10, lo
; CHECK-NEXT: ret
%rem = urem i32 %X, 5
%cmp = icmp eq i32 %rem, 0
%ret = select i1 %cmp, i32 42, i32 -10
ret i32 %ret
}