78 lines
2.0 KiB
LLVM
78 lines
2.0 KiB
LLVM
|
; RUN: llc < %s -march=x86 | FileCheck %s
|
||
|
|
|
||
|
|
define i32 @t1(i8* %X, i32 %i) {
|
||
|
|
; CHECK: t1:
|
||
|
|
; CHECK-NOT: and
|
||
|
|
; CHECK: movzbl
|
||
|
|
; CHECK: movl (%{{...}},%{{...}},4),
|
||
|
|
; CHECK: ret
|
||
|
|
|
||
|
|
entry:
|
||
|
|
%tmp2 = shl i32 %i, 2
|
||
|
|
%tmp4 = and i32 %tmp2, 1020
|
||
|
|
%tmp7 = getelementptr i8* %X, i32 %tmp4
|
||
|
|
%tmp78 = bitcast i8* %tmp7 to i32*
|
||
|
|
%tmp9 = load i32* %tmp78
|
||
|
|
ret i32 %tmp9
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @t2(i16* %X, i32 %i) {
|
||
|
|
; CHECK: t2:
|
||
|
|
; CHECK-NOT: and
|
||
|
|
; CHECK: movzwl
|
||
|
|
; CHECK: movl (%{{...}},%{{...}},4),
|
||
|
|
; CHECK: ret
|
||
|
|
|
||
|
|
entry:
|
||
|
|
%tmp2 = shl i32 %i, 1
|
||
|
|
%tmp4 = and i32 %tmp2, 131070
|
||
|
|
%tmp7 = getelementptr i16* %X, i32 %tmp4
|
||
|
|
%tmp78 = bitcast i16* %tmp7 to i32*
|
||
|
|
%tmp9 = load i32* %tmp78
|
||
|
|
ret i32 %tmp9
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @t3(i16* %i.ptr, i32* %arr) {
|
||
|
|
; This case is tricky. The lshr followed by a gep will produce a lshr followed
|
||
|
|
; by an and to remove the low bits. This can be simplified by doing the lshr by
|
||
|
|
; a greater constant and using the addressing mode to scale the result back up.
|
||
|
|
; To make matters worse, because of the two-phase zext of %i and their reuse in
|
||
|
|
; the function, the DAG can get confusing trying to re-use both of them and
|
||
|
|
; prevent easy analysis of the mask in order to match this.
|
||
|
|
; CHECK: t3:
|
||
|
|
; CHECK-NOT: and
|
||
|
|
; CHECK: shrl
|
||
|
|
; CHECK: addl (%{{...}},%{{...}},4),
|
||
|
|
; CHECK: ret
|
||
|
|
|
||
|
|
entry:
|
||
|
|
%i = load i16* %i.ptr
|
||
|
|
%i.zext = zext i16 %i to i32
|
||
|
|
%index = lshr i32 %i.zext, 11
|
||
|
|
%val.ptr = getelementptr inbounds i32* %arr, i32 %index
|
||
|
|
%val = load i32* %val.ptr
|
||
|
|
%sum = add i32 %val, %i.zext
|
||
|
|
ret i32 %sum
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @t4(i16* %i.ptr, i32* %arr) {
|
||
|
|
; A version of @t3 that has more zero extends and more re-use of intermediate
|
||
|
|
; values. This exercise slightly different bits of canonicalization.
|
||
|
|
; CHECK: t4:
|
||
|
|
; CHECK-NOT: and
|
||
|
|
; CHECK: shrl
|
||
|
|
; CHECK: addl (%{{...}},%{{...}},4),
|
||
|
|
; CHECK: ret
|
||
|
|
|
||
|
|
entry:
|
||
|
|
%i = load i16* %i.ptr
|
||
|
|
%i.zext = zext i16 %i to i32
|
||
|
|
%index = lshr i32 %i.zext, 11
|
||
|
|
%index.zext = zext i32 %index to i64
|
||
|
|
%val.ptr = getelementptr inbounds i32* %arr, i64 %index.zext
|
||
|
|
%val = load i32* %val.ptr
|
||
|
|
%sum.1 = add i32 %val, %i.zext
|
||
|
|
%sum.2 = add i32 %sum.1, %index
|
||
|
|
ret i32 %sum.2
|
||
|
|
}
|