| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6 |
| ; RUN: opt -passes=gvn -S < %s | FileCheck %s |
| |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64" |
| |
| ; GVN shouldn't PRE the load around the loop backedge because it's |
| ; not actually redundant around the loop backedge, despite appearances |
| ; if phi-translation is ignored. |
| |
| define void @test0(ptr %begin) { |
| ; CHECK-LABEL: define void @test0( |
| ; CHECK-SAME: ptr [[BEGIN:%.*]]) { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: br label %[[LOOP:.*]] |
| ; CHECK: [[LOOP]]: |
| ; CHECK-NEXT: [[PHI:%.*]] = phi ptr [ [[BEGIN]], %[[ENTRY]] ], [ [[NEXT:%.*]], %[[LOOP]] ] |
| ; CHECK-NEXT: [[L0:%.*]] = load i8, ptr [[PHI]], align 1 |
| ; CHECK-NEXT: call void @bar(i8 [[L0]]) |
| ; CHECK-NEXT: [[L1:%.*]] = load i8, ptr [[PHI]], align 1 |
| ; CHECK-NEXT: [[NEXT]] = getelementptr inbounds i8, ptr [[PHI]], i8 [[L1]] |
| ; CHECK-NEXT: br label %[[LOOP]] |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %phi = phi ptr [ %begin, %entry ], [ %next, %loop ] |
| %l0 = load i8, ptr %phi |
| call void @bar(i8 %l0) |
| %l1 = load i8, ptr %phi |
| %next = getelementptr inbounds i8, ptr %phi, i8 %l1 |
| br label %loop |
| } |
| |
| declare void @bar(i8) |
