1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=reassociate -S | FileCheck %s
; B * 5 + A * -5
; TODO: (B - A) * 5
define half @faddsubAssoc1(half %a, half %b) {
; CHECK-LABEL: @faddsubAssoc1(
; CHECK-NEXT: [[T2_NEG:%.*]] = fmul fast half [[A:%.*]], 0xHC500
; CHECK-NEXT: [[REASS_MUL:%.*]] = fmul fast half [[B:%.*]], 0xH4500
; CHECK-NEXT: [[T5:%.*]] = fadd fast half [[REASS_MUL]], [[T2_NEG]]
; CHECK-NEXT: ret half [[T5]]
;
%t1 = fmul fast half %b, 0xH4200 ; 3*b
%t2 = fmul fast half %a, 0xH4500 ; 5*a
%t3 = fmul fast half %b, 0xH4000 ; 2*b
%t4 = fsub fast half %t2, %t1 ; 5 * a - 3 * b
%t5 = fsub fast half %t3, %t4 ; 2 * b - ( 5 * a - 3 * b)
ret half %t5 ; = 5 * (b - a)
}
; B + A * 5
define half @faddsubAssoc2(half %a, half %b) {
; CHECK-LABEL: @faddsubAssoc2(
; CHECK-NEXT: [[T2:%.*]] = fmul fast half [[A:%.*]], 0xH4500
; CHECK-NEXT: [[T5:%.*]] = fadd fast half [[B:%.*]], [[T2]]
; CHECK-NEXT: ret half [[T5]]
;
%t1 = fmul fast half %b, 0xH4200 ; 3*b
%t2 = fmul fast half %a, 0xH4500 ; 5*a
%t3 = fmul fast half %b, 0xH4000 ; 2*b
%t4 = fadd fast half %t2, %t1 ; 5 * a + 3 * b
%t5 = fsub fast half %t4, %t3 ; (5 * a + 3 * b) - (2 * b)
ret half %t5 ; = 5 * a + b
}
|
