RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-02-01 05:01:59 +01:00
Code Issues Projects Releases Wiki Activity
llvm-mirror/test/Transforms/InstCombine/sub-minmax.ll
Roman Lebedev 86ab9e2d52 [InstCombine] Sink sub into hands of select if one hand becomes zero. Part 2 (PR44426) 
This decreases use count of %Op0, makes one hand of select to be 0,
and possibly exposes further folding potential.

Name: sub %Op0, (select %Cond, %Op0, %FalseVal) -> select %Cond, 0, (sub %Op0, %FalseVal)
  %Op0 = %TrueVal
  %o = select i1 %Cond, i8 %Op0, i8 %FalseVal
  %r = sub i8 %Op0, %o
=>
  %n = sub i8 %Op0, %FalseVal
  %r = select i1 %Cond, i8 0, i8 %n

Name: sub %Op0, (select %Cond, %TrueVal, %Op0) -> select %Cond, (sub %Op0, %TrueVal), 0
  %Op0 = %FalseVal
  %o = select i1 %Cond, i8 %TrueVal, i8 %Op0
  %r = sub i8 %Op0, %o
=>
  %n = sub i8 %Op0, %TrueVal
  %r = select i1 %Cond, i8 %n, i8 0

https://rise4fun.com/Alive/aHRt

https://bugs.llvm.org/show_bug.cgi?id=44426
2020-01-04 17:30:51 +03:00

344 lines
11 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @max_na_b_minux_na(i32 %A, i32 %B) {
; CHECK-LABEL: @max_na_b_minux_na(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[NOT]], i32 [[B:%.*]])
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: ret i32 [[TMP2]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, %B
%l1 = select i1 %l0, i32 %not, i32 %B
%x = sub i32 %l1, %not
ret i32 %x
}
define i32 @na_minus_max_na_b(i32 %A, i32 %B) {
; CHECK-LABEL: @na_minus_max_na_b(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[NOT]], i32 [[B:%.*]])
; CHECK-NEXT: ret i32 [[TMP1]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, %B
%l1 = select i1 %l0, i32 %not, i32 %B
%x = sub i32 %not, %l1
ret i32 %x
}
define i32 @max_b_na_minus_na(i32 %A, i32 %B) {
; CHECK-LABEL: @max_b_na_minus_na(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[NOT]], i32 [[B:%.*]])
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: ret i32 [[TMP2]]
;
%not = xor i32 %A, -1
%l0 = icmp ugt i32 %not, %B
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %l1, %not
ret i32 %x
}
define i32 @na_minus_max_b_na(i32 %A, i32 %B) {
; CHECK-LABEL: @na_minus_max_b_na(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[NOT]], i32 [[B:%.*]])
; CHECK-NEXT: ret i32 [[TMP1]]
;
%not = xor i32 %A, -1
%l0 = icmp ugt i32 %not, %B
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %not, %l1
ret i32 %x
}
define i32 @max_na_bi_minux_na(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_na_bi_minux_na(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[BI:%.*]], i32 [[A:%.*]])
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: ret i32 [[TMP2]]
;
%B = xor i32 %Bi, -1
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, %B
%l1 = select i1 %l0, i32 %not, i32 %B
%x = sub i32 %l1, %not
ret i32 %x
}
define i32 @na_minus_max_na_bi(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_na_bi(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[BI:%.*]], i32 [[A:%.*]])
; CHECK-NEXT: ret i32 [[TMP1]]
;
%B = xor i32 %Bi, -1
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, %B
%l1 = select i1 %l0, i32 %not, i32 %B
%x = sub i32 %not, %l1
ret i32 %x
}
define i32 @max_bi_na_minus_na(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_bi_na_minus_na(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[BI:%.*]], i32 [[A:%.*]])
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: ret i32 [[TMP2]]
;
%B = xor i32 %Bi, -1
%not = xor i32 %A, -1
%l0 = icmp ugt i32 %not, %B
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %l1, %not
ret i32 %x
}
define i32 @na_minus_max_bi_na(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_bi_na(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[BI:%.*]], i32 [[A:%.*]])
; CHECK-NEXT: ret i32 [[TMP1]]
;
%B = xor i32 %Bi, -1
%not = xor i32 %A, -1
%l0 = icmp ugt i32 %not, %B
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %not, %l1
ret i32 %x
}
define i32 @max_na_bi_minux_na_use(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_na_bi_minux_na_use(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i32 [[A:%.*]], -32
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[A]], i32 -32
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[A]], [[TMP2]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, 31
%l1 = select i1 %l0, i32 %not, i32 31
%x = sub i32 %l1, %not
call void @use32(i32 %l1)
ret i32 %x
}
define i32 @na_minus_max_na_bi_use(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_na_bi_use(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i32 [[A:%.*]], -32
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[A]], i32 -32
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[TMP2]], [[A]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, 31
%l1 = select i1 %l0, i32 %not, i32 31
%x = sub i32 %not, %l1
call void @use32(i32 %l1)
ret i32 %x
}
define i32 @max_bi_na_minus_na_use(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_bi_na_minus_na_use(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A:%.*]], [[BI:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[BI]], i32 [[A]]
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[A]], [[TMP2]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%B = xor i32 %Bi, -1
%l0 = icmp ult i32 %B, %not
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %l1, %not
call void @use32(i32 %l1)
ret i32 %x
}
define i32 @na_minus_max_bi_na_use(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_bi_na_use(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A:%.*]], [[BI:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[BI]], i32 [[A]]
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[TMP2]], [[A]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%B = xor i32 %Bi, -1
%l0 = icmp ult i32 %B, %not
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %not, %l1
call void @use32(i32 %l1)
ret i32 %x
}
define i32 @max_na_bi_minux_na_use2(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_na_bi_minux_na_use2(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[L0:%.*]] = icmp ult i32 [[NOT]], 31
; CHECK-NEXT: [[L1:%.*]] = select i1 [[L0]], i32 [[NOT]], i32 31
; CHECK-NEXT: [[X:%.*]] = sub i32 [[L1]], [[NOT]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: call void @use32(i32 [[NOT]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, 31
%l1 = select i1 %l0, i32 %not, i32 31
%x = sub i32 %l1, %not
call void @use32(i32 %l1)
call void @use32(i32 %not)
ret i32 %x
}
define i32 @na_minus_max_na_bi_use2(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_na_bi_use2(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[L0:%.*]] = icmp ult i32 [[NOT]], 31
; CHECK-NEXT: [[L1:%.*]] = select i1 [[L0]], i32 [[NOT]], i32 31
; CHECK-NEXT: [[X:%.*]] = sub i32 [[NOT]], [[L1]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: call void @use32(i32 [[NOT]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%l0 = icmp ult i32 %not, 31
%l1 = select i1 %l0, i32 %not, i32 31
%x = sub i32 %not, %l1
call void @use32(i32 %l1)
call void @use32(i32 %not)
ret i32 %x
}
define i32 @max_bi_na_minus_na_use2(i32 %A, i32 %Bi) {
; CHECK-LABEL: @max_bi_na_minus_na_use2(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A]], [[BI:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[BI]], i32 [[A]]
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[A]], [[TMP2]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: call void @use32(i32 [[NOT]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%B = xor i32 %Bi, -1
%l0 = icmp ult i32 %B, %not
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %l1, %not
call void @use32(i32 %l1)
call void @use32(i32 %not)
ret i32 %x
}
define i32 @na_minus_max_bi_na_use2(i32 %A, i32 %Bi) {
; CHECK-LABEL: @na_minus_max_bi_na_use2(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A]], [[BI:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[BI]], i32 [[A]]
; CHECK-NEXT: [[L1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT: [[X:%.*]] = sub i32 [[TMP2]], [[A]]
; CHECK-NEXT: call void @use32(i32 [[L1]])
; CHECK-NEXT: call void @use32(i32 [[NOT]])
; CHECK-NEXT: ret i32 [[X]]
;
%not = xor i32 %A, -1
%B = xor i32 %Bi, -1
%l0 = icmp ult i32 %B, %not
%l1 = select i1 %l0, i32 %B, i32 %not
%x = sub i32 %not, %l1
call void @use32(i32 %l1)
call void @use32(i32 %not)
ret i32 %x
}
define i8 @umin_not_sub(i8 %x, i8 %y) {
; CHECK-LABEL: @umin_not_sub(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i8 [[X]], i8 [[Y]]
; CHECK-NEXT: [[MINXY:%.*]] = xor i8 [[TMP2]], -1
; CHECK-NEXT: [[SUBX:%.*]] = sub i8 [[TMP2]], [[X]]
; CHECK-NEXT: [[SUBY:%.*]] = sub i8 [[TMP2]], [[Y]]
; CHECK-NEXT: call void @use8(i8 [[SUBX]])
; CHECK-NEXT: call void @use8(i8 [[SUBY]])
; CHECK-NEXT: ret i8 [[MINXY]]
;
%nx = xor i8 %x, -1
%ny = xor i8 %y, -1
%cmpxy = icmp ult i8 %nx, %ny
%minxy = select i1 %cmpxy, i8 %nx, i8 %ny
%subx = sub i8 %nx, %minxy
%suby = sub i8 %ny, %minxy
call void @use8(i8 %subx)
call void @use8(i8 %suby)
ret i8 %minxy
}
define i8 @umin_not_sub_rev(i8 %x, i8 %y) {
; CHECK-LABEL: @umin_not_sub_rev(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i8 [[X]], i8 [[Y]]
; CHECK-NEXT: [[MINXY:%.*]] = xor i8 [[TMP2]], -1
; CHECK-NEXT: [[SUBX:%.*]] = sub i8 [[X]], [[TMP2]]
; CHECK-NEXT: [[SUBY:%.*]] = sub i8 [[Y]], [[TMP2]]
; CHECK-NEXT: call void @use8(i8 [[SUBX]])
; CHECK-NEXT: call void @use8(i8 [[SUBY]])
; CHECK-NEXT: ret i8 [[MINXY]]
;
%nx = xor i8 %x, -1
%ny = xor i8 %y, -1
%cmpxy = icmp ult i8 %nx, %ny
%minxy = select i1 %cmpxy, i8 %nx, i8 %ny
%subx = sub i8 %minxy, %nx
%suby = sub i8 %minxy, %ny
call void @use8(i8 %subx)
call void @use8(i8 %suby)
ret i8 %minxy
}
define void @umin3_not_all_ops_extra_uses_invert_subs(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @umin3_not_all_ops_extra_uses_invert_subs(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X:%.*]], [[Z:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i8 [[X]], i8 [[Z]]
; CHECK-NEXT: [[TMP3:%.*]] = icmp ugt i8 [[TMP2]], [[Y:%.*]]
; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i8 [[TMP2]], i8 [[Y]]
; CHECK-NEXT: [[TMP5:%.*]] = xor i8 [[TMP4]], -1
; CHECK-NEXT: [[XMIN:%.*]] = sub i8 [[TMP4]], [[X]]
; CHECK-NEXT: [[YMIN:%.*]] = sub i8 [[TMP4]], [[Y]]
; CHECK-NEXT: [[ZMIN:%.*]] = sub i8 [[TMP4]], [[Z]]
; CHECK-NEXT: call void @use8(i8 [[TMP5]])
; CHECK-NEXT: call void @use8(i8 [[XMIN]])
; CHECK-NEXT: call void @use8(i8 [[YMIN]])
; CHECK-NEXT: call void @use8(i8 [[ZMIN]])
; CHECK-NEXT: ret void
;
%xn = xor i8 %x, -1
%yn = xor i8 %y, -1
%zn = xor i8 %z, -1
%cmpxz = icmp ult i8 %xn, %zn
%minxz = select i1 %cmpxz, i8 %xn, i8 %zn
%cmpxyz = icmp ult i8 %minxz, %yn
%minxyz = select i1 %cmpxyz, i8 %minxz, i8 %yn
%xmin = sub i8 %xn, %minxyz
%ymin = sub i8 %yn, %minxyz
%zmin = sub i8 %zn, %minxyz
call void @use8(i8 %minxyz)
call void @use8(i8 %xmin)
call void @use8(i8 %ymin)
call void @use8(i8 %zmin)
ret void
}
declare void @use8(i8)
declare void @use32(i32 %u)
Reference in New Issue View Git Blame Copy Permalink