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
|
; RUN: llc < %s -mcpu=swift -mtriple=armv7s-apple-ios | FileCheck %s
; Check that we avoid producing vldm instructions using d registers that
; begin in the most-significant half of a q register. These require more
; micro-ops on swift and so aren't worth combining.
; CHECK-LABEL: test_vldm
; CHECK: vldmia r{{[0-9]+}}, {d2, d3, d4}
; CHECK-NOT: vldmia r{{[0-9]+}}, {d1, d2, d3, d4}
declare fastcc void @force_register(double %d0, double %d1, double %d2, double %d3, double %d4)
define void @test_vldm(double* %x, double * %y) {
entry:
%addr1 = getelementptr double, double * %x, i32 1
%addr2 = getelementptr double, double * %x, i32 2
%addr3 = getelementptr double, double * %x, i32 3
%d0 = load double , double * %y
%d1 = load double , double * %x
%d2 = load double , double * %addr1
%d3 = load double , double * %addr2
%d4 = load double , double * %addr3
; We are trying to force x[0-3] in registers d1 to d4 so that we can test we
; don't form a "vldmia rX, {d1, d2, d3, d4}".
; We are relying on the calling convention and that register allocation
; properly coalesces registers.
call fastcc void @force_register(double %d0, double %d1, double %d2, double %d3, double %d4)
ret void
}
|
