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[InstCombine] add tests for load narrowing; NFC 

Baseline results for D64432.

llvm-svn: 366901
This commit is contained in:
Sanjay Patel 2019-07-24 12:44:21 +00:00
parent 9842310a2a
commit 3624074426
1 changed files with 43 additions and 7 deletions
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50
llvm/test/Transforms/InstCombine/trunc-load.ll
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@ -2,8 +2,10 @@
; RUN: opt < %s -instcombine -S -data-layout="e-n16:32:64" | FileCheck %s --check-prefixes=CHECK,LE
; RUN: opt < %s -instcombine -S -data-layout="E-n16:32:64" | FileCheck %s --check-prefixes=CHECK,BE
define i32 @truncload(i64* %ptr) {
; CHECK-LABEL: @truncload(
; Don't narrow if it would lose information about the dereferenceable range of the pointer.
define i32 @truncload_no_deref(i64* %ptr) {
; CHECK-LABEL: @truncload_no_deref(
; CHECK-NEXT: [[X:%.*]] = load i64, i64* [[PTR:%.*]], align 4
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
; CHECK-NEXT: ret i32 [[R]]
@ -13,7 +15,33 @@ define i32 @truncload(i64* %ptr) {
ret i32 %r
}
define i16 @truncload_align(i32* %ptr) {
define i32 @truncload_small_deref(i64* dereferenceable(7) %ptr) {
; CHECK-LABEL: @truncload_small_deref(
; CHECK-NEXT: [[X:%.*]] = load i64, i64* [[PTR:%.*]], align 4
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
; CHECK-NEXT: ret i32 [[R]]
;
%x = load i64, i64* %ptr
%r = trunc i64 %x to i32
ret i32 %r
}
; On little-endian, we can narrow the load without an offset.
define i32 @truncload_deref(i64* dereferenceable(8) %ptr) {
; CHECK-LABEL: @truncload_deref(
; CHECK-NEXT: [[X:%.*]] = load i64, i64* [[PTR:%.*]], align 4
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
; CHECK-NEXT: ret i32 [[R]]
;
%x = load i64, i64* %ptr
%r = trunc i64 %x to i32
ret i32 %r
}
; Preserve alignment.
define i16 @truncload_align(i32* dereferenceable(14) %ptr) {
; CHECK-LABEL: @truncload_align(
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[PTR:%.*]], align 16
; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X]] to i16
@ -24,9 +52,11 @@ define i16 @truncload_align(i32* %ptr) {
ret i16 %r
}
; Negative test - extra use means we would not eliminate the original load.
declare void @use(i64)
define i32 @truncload_extra_use(i64* %ptr) {
define i32 @truncload_extra_use(i64* dereferenceable(100) %ptr) {
; CHECK-LABEL: @truncload_extra_use(
; CHECK-NEXT: [[X:%.*]] = load i64, i64* [[PTR:%.*]], align 2
; CHECK-NEXT: call void @use(i64 [[X]])
@ -39,7 +69,9 @@ define i32 @truncload_extra_use(i64* %ptr) {
ret i32 %r
}
define i8 @truncload_type(i64* %ptr) {
; Negative test - don't create a load if the type is not allowed by the data-layout.
define i8 @truncload_type(i64* dereferenceable(9) %ptr) {
; CHECK-LABEL: @truncload_type(
; CHECK-NEXT: [[X:%.*]] = load i64, i64* [[PTR:%.*]], align 2
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i8
@ -50,7 +82,9 @@ define i8 @truncload_type(i64* %ptr) {
ret i8 %r
}
define i32 @truncload_volatile(i64* %ptr) {
; Negative test - don't transform volatiles.
define i32 @truncload_volatile(i64* dereferenceable(8) %ptr) {
; CHECK-LABEL: @truncload_volatile(
; CHECK-NEXT: [[X:%.*]] = load volatile i64, i64* [[PTR:%.*]], align 8
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
@ -61,7 +95,9 @@ define i32 @truncload_volatile(i64* %ptr) {
ret i32 %r
}
define i32 @truncload_address_space(i64 addrspace(1)* %ptr) {
; Preserve address space.
define i32 @truncload_address_space(i64 addrspace(1)* dereferenceable(8) %ptr) {
; CHECK-LABEL: @truncload_address_space(
; CHECK-NEXT: [[X:%.*]] = load i64, i64 addrspace(1)* [[PTR:%.*]], align 4
; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32