llvm/test/Transforms/InstCombine/loadstore-alignment.ll
Yaxun Liu f570b5fd16 Fix known zero bits for addrspacecast.
Currently LLVM assumes that a pointer addrspacecasted to a different addr space is equivalent to trunc or zext bitwise, which is not true. For example, in amdgcn target, when a null pointer is addrspacecasted from addr space 4 to 0, its value is changed from i64 0 to i32 -1.

This patch teaches LLVM not to assume known bits of addrspacecast instruction to its operand.

Differential Revision: https://reviews.llvm.org/D26803


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287545 91177308-0d34-0410-b5e6-96231b3b80d8
2016-11-21 15:42:31 +00:00

91 lines
2.3 KiB
LLVM

; RUN: opt -instcombine -S < %s | FileCheck %s
target datalayout = "E-p:64:64:64-p1:64:64:64-p2:32:32:32-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
@x = external global <2 x i64>, align 16
@xx = external global [13 x <2 x i64>], align 16
@x.as2 = external addrspace(2) global <2 x i64>, align 16
; CHECK-LABEL: @static_hem(
; CHECK: , align 16
define <2 x i64> @static_hem() {
%t = getelementptr <2 x i64>, <2 x i64>* @x, i32 7
%tmp1 = load <2 x i64>, <2 x i64>* %t, align 1
ret <2 x i64> %tmp1
}
; CHECK-LABEL: @hem(
; CHECK: , align 16
define <2 x i64> @hem(i32 %i) {
%t = getelementptr <2 x i64>, <2 x i64>* @x, i32 %i
%tmp1 = load <2 x i64>, <2 x i64>* %t, align 1
ret <2 x i64> %tmp1
}
; CHECK-LABEL: @hem_2d(
; CHECK: , align 16
define <2 x i64> @hem_2d(i32 %i, i32 %j) {
%t = getelementptr [13 x <2 x i64>], [13 x <2 x i64>]* @xx, i32 %i, i32 %j
%tmp1 = load <2 x i64>, <2 x i64>* %t, align 1
ret <2 x i64> %tmp1
}
; CHECK-LABEL: @foo(
; CHECK: , align 16
define <2 x i64> @foo() {
%tmp1 = load <2 x i64>, <2 x i64>* @x, align 1
ret <2 x i64> %tmp1
}
; CHECK-LABEL: @bar(
; CHECK: , align 16
; CHECK: , align 16
define <2 x i64> @bar() {
%t = alloca <2 x i64>
call void @kip(<2 x i64>* %t)
%tmp1 = load <2 x i64>, <2 x i64>* %t, align 1
ret <2 x i64> %tmp1
}
; CHECK-LABEL: @static_hem_store(
; CHECK: , align 16
define void @static_hem_store(<2 x i64> %y) {
%t = getelementptr <2 x i64>, <2 x i64>* @x, i32 7
store <2 x i64> %y, <2 x i64>* %t, align 1
ret void
}
; CHECK-LABEL: @hem_store(
; CHECK: , align 16
define void @hem_store(i32 %i, <2 x i64> %y) {
%t = getelementptr <2 x i64>, <2 x i64>* @x, i32 %i
store <2 x i64> %y, <2 x i64>* %t, align 1
ret void
}
; CHECK-LABEL: @hem_2d_store(
; CHECK: , align 16
define void @hem_2d_store(i32 %i, i32 %j, <2 x i64> %y) {
%t = getelementptr [13 x <2 x i64>], [13 x <2 x i64>]* @xx, i32 %i, i32 %j
store <2 x i64> %y, <2 x i64>* %t, align 1
ret void
}
; CHECK-LABEL: @foo_store(
; CHECK: , align 16
define void @foo_store(<2 x i64> %y) {
store <2 x i64> %y, <2 x i64>* @x, align 1
ret void
}
; CHECK-LABEL: @bar_store(
; CHECK: , align 16
define void @bar_store(<2 x i64> %y) {
%t = alloca <2 x i64>
call void @kip(<2 x i64>* %t)
store <2 x i64> %y, <2 x i64>* %t, align 1
ret void
}
declare void @kip(<2 x i64>* %t)