1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
; RUN: llc < %s -mtriple=i686-linux -mattr=+sse2 | grep movsd | count 5
; RUN: llc < %s -mtriple=i686-linux -mattr=+sse2 | grep movl | count 2
@atomic = global double 0.000000e+00 ; <double*> [#uses=1]
@atomic2 = global double 0.000000e+00 ; <double*> [#uses=1]
@anything = global i64 0 ; <i64*> [#uses=1]
@ioport = global i32 0 ; <i32*> [#uses=2]
define i16 @f(i64 %x, double %y) {
%b = bitcast i64 %x to double ; <double> [#uses=1]
volatile store double %b, double* @atomic ; one processor operation only
volatile store double 0.000000e+00, double* @atomic2 ; one processor operation only
%b2 = bitcast double %y to i64 ; <i64> [#uses=1]
volatile store i64 %b2, i64* @anything ; may transform to store of double
%l = volatile load i32* @ioport ; must not narrow
%t = trunc i32 %l to i16 ; <i16> [#uses=1]
%l2 = volatile load i32* @ioport ; must not narrow
%tmp = lshr i32 %l2, 16 ; <i32> [#uses=1]
%t2 = trunc i32 %tmp to i16 ; <i16> [#uses=1]
%f = add i16 %t, %t2 ; <i16> [#uses=1]
ret i16 %f
}
|
