a266af7211
Now that integer min/max intrinsics have good support in both InstCombine and other passes, start canonicalizing SPF min/max to intrinsic min/max. Once this sticks, we can stop matching SPF min/max in various places, and can remove hacks we have for preventing infinite loops and breaking of SPF canonicalization. Differential Revision: https://reviews.llvm.org/D98152
25 lines
726 B
LLVM
25 lines
726 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -S -passes=instcombine -instcombine-infinite-loop-threshold=2 < %s | FileCheck %s
|
|
|
|
; This test used to cause an infinite combine loop.
|
|
|
|
define i16 @passthru(i16 returned %x) {
|
|
; CHECK-LABEL: @passthru(
|
|
; CHECK-NEXT: ret i16 [[X:%.*]]
|
|
;
|
|
ret i16 %x
|
|
}
|
|
|
|
define i16 @test(i16 %arg) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: [[ZERO:%.*]] = call i16 @passthru(i16 0)
|
|
; CHECK-NEXT: [[TMP1:%.*]] = call i16 @llvm.smax.i16(i16 [[ARG:%.*]], i16 0)
|
|
; CHECK-NEXT: ret i16 [[TMP1]]
|
|
;
|
|
%zero = call i16 @passthru(i16 0)
|
|
%sub = sub nuw nsw i16 %arg, %zero
|
|
%cmp = icmp slt i16 %sub, 0
|
|
%ret = select i1 %cmp, i16 0, i16 %sub
|
|
ret i16 %ret
|
|
}
|