-
Notifications
You must be signed in to change notification settings - Fork 10.9k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Pre-commit a min/max idiom breakage test for D149918
- Loading branch information
Showing
1 changed file
with
23 additions
and
0 deletions.
There are no files selected for viewing
23 changes: 23 additions & 0 deletions
23
llvm/test/Transforms/InstCombine/ashr-icmp-minmax-idiom-break.ll
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,23 @@ | ||
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2 | ||
; RUN: opt < %s -passes=instcombine -S | FileCheck %s | ||
|
||
; This test is pre-committed to show sub-optimal codegen due to | ||
; min/max idiom breakage. On AArch64, these constants are also expensive to materialize, | ||
; and therefore generate poor code vs maintaining the min/max idiom. | ||
|
||
define i64 @dont_break_minmax_i64(i64 %conv, i64 %conv2) { | ||
; CHECK-LABEL: define i64 @dont_break_minmax_i64 | ||
; CHECK-SAME: (i64 [[CONV:%.*]], i64 [[CONV2:%.*]]) { | ||
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i64 [[CONV]], [[CONV2]] | ||
; CHECK-NEXT: [[SHR:%.*]] = ashr i64 [[MUL]], 4 | ||
; CHECK-NEXT: [[CMP4_I:%.*]] = icmp slt i64 [[MUL]], 5579712 | ||
; CHECK-NEXT: [[SPEC_SELECT_I:%.*]] = select i1 [[CMP4_I]], i64 [[SHR]], i64 348731 | ||
; CHECK-NEXT: ret i64 [[SPEC_SELECT_I]] | ||
; | ||
%mul = mul nsw i64 %conv, %conv2 | ||
%shr = ashr i64 %mul, 4 | ||
%cmp4.i = icmp sgt i64 %shr, 348731 | ||
%switch.i = icmp ult i1 %cmp4.i, true | ||
%spec.select.i = select i1 %switch.i, i64 %shr, i64 348731 | ||
ret i64 %spec.select.i | ||
} |