1 ; RUN: opt < %s -reassociate -S | FileCheck %s
2 ; CHECK-LABEL: faddsubAssoc1
3 ; CHECK: [[TMP1:%tmp.*]] = fmul fast half %a, 0xH4500
4 ; CHECK: [[TMP2:%tmp.*]] = fmul fast half %b, 0xH4500
5 ; CHECK: fsub fast half [[TMP2]], [[TMP1]]
7 ; Input is A op (B op C)
8 define half @faddsubAssoc1(half %a, half %b) {
9 %tmp1 = fmul fast half %b, 0xH4200 ; 3*b
10 %tmp2 = fmul fast half %a, 0xH4500 ; 5*a
11 %tmp3 = fmul fast half %b, 0xH4000 ; 2*b
12 %tmp4 = fsub fast half %tmp2, %tmp1 ; 5 * a - 3 * b
13 %tmp5 = fsub fast half %tmp3, %tmp4 ; 2 * b - ( 5 * a - 3 * b)
14 ret half %tmp5 ; = 5 * (b - a)
17 ; CHECK-LABEL: faddsubAssoc2
18 ; CHECK: [[TMP1:%tmp.*]] = fmul fast half %a, 0xH4500
19 ; CHECK: [[TMP2:%tmp.*]] = fmul fast half %b, 0xH3C00
20 ; CHECK: fadd fast half [[TMP2]], [[TMP1]]
22 ; Input is (A op B) op C
23 define half @faddsubAssoc2(half %a, half %b) {
24 %tmp1 = fmul fast half %b, 0xH4200 ; 3*b
25 %tmp2 = fmul fast half %a, 0xH4500 ; 5*a
26 %tmp3 = fmul fast half %b, 0xH4000 ; 2*b
27 %tmp4 = fadd fast half %tmp2, %tmp1 ; 5 * a + 3 * b
28 %tmp5 = fsub fast half %tmp4, %tmp3 ; (5 * a + 3 * b) - (2 * b)
29 ret half %tmp5 ; = 5 * a + b