derek.holloway
7502bf64a4
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110 lines
3.3 KiB
LLVM
110 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S -data-layout="e-n16:32:64" | FileCheck %s
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; RUN: opt < %s -passes=instcombine -S -data-layout="E-n16:32:64" | FileCheck %s
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; Don't narrow if it would lose information about the dereferenceable range of the pointer.
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define i32 @truncload_no_deref(ptr %ptr) {
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; CHECK-LABEL: @truncload_no_deref(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[PTR:%.*]], align 4
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load i64, ptr %ptr
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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define i32 @truncload_small_deref(ptr dereferenceable(7) %ptr) {
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; CHECK-LABEL: @truncload_small_deref(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[PTR:%.*]], align 4
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load i64, ptr %ptr
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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; On little-endian, we can narrow the load without an offset.
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define i32 @truncload_deref(ptr dereferenceable(8) %ptr) {
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; CHECK-LABEL: @truncload_deref(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[PTR:%.*]], align 4
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load i64, ptr %ptr
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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; Preserve alignment.
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define i16 @truncload_align(ptr dereferenceable(14) %ptr) {
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; CHECK-LABEL: @truncload_align(
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[PTR:%.*]], align 16
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; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X]] to i16
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x = load i32, ptr %ptr, align 16
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%r = trunc i32 %x to i16
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ret i16 %r
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}
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; Negative test - extra use means we would not eliminate the original load.
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declare void @use(i64)
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define i32 @truncload_extra_use(ptr dereferenceable(100) %ptr) {
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; CHECK-LABEL: @truncload_extra_use(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[PTR:%.*]], align 2
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; CHECK-NEXT: call void @use(i64 [[X]])
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load i64, ptr %ptr, align 2
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call void @use(i64 %x)
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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; Negative test - don't create a load if the type is not allowed by the data-layout.
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define i8 @truncload_type(ptr dereferenceable(9) %ptr) {
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; CHECK-LABEL: @truncload_type(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[PTR:%.*]], align 2
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i8
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = load i64, ptr %ptr, align 2
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%r = trunc i64 %x to i8
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ret i8 %r
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}
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; Negative test - don't transform volatiles.
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define i32 @truncload_volatile(ptr dereferenceable(8) %ptr) {
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; CHECK-LABEL: @truncload_volatile(
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; CHECK-NEXT: [[X:%.*]] = load volatile i64, ptr [[PTR:%.*]], align 8
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load volatile i64, ptr %ptr, align 8
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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; Preserve address space.
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define i32 @truncload_address_space(ptr addrspace(1) dereferenceable(8) %ptr) {
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; CHECK-LABEL: @truncload_address_space(
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; CHECK-NEXT: [[X:%.*]] = load i64, ptr addrspace(1) [[PTR:%.*]], align 4
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; CHECK-NEXT: [[R:%.*]] = trunc i64 [[X]] to i32
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = load i64, ptr addrspace(1) %ptr, align 4
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%r = trunc i64 %x to i32
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ret i32 %r
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}
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