| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -simplifycfg -forward-switch-cond=false -S | FileCheck %s --check-prefix=NO_FWD |
| ; RUN: opt < %s -simplifycfg -forward-switch-cond=true -S | FileCheck %s --check-prefix=FWD |
| |
| ; PR10131 |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" |
| target triple = "i386-pc-linux-gnu" |
| |
| define i32 @t(i32 %m) nounwind readnone { |
| ; NO_FWD-LABEL: @t( |
| ; NO_FWD-NEXT: entry: |
| ; NO_FWD-NEXT: switch i32 [[M:%.*]], label [[SW_BB4:%.*]] [ |
| ; NO_FWD-NEXT: i32 0, label [[RETURN:%.*]] |
| ; NO_FWD-NEXT: i32 1, label [[SW_BB1:%.*]] |
| ; NO_FWD-NEXT: i32 2, label [[SW_BB2:%.*]] |
| ; NO_FWD-NEXT: i32 3, label [[SW_BB3:%.*]] |
| ; NO_FWD-NEXT: ] |
| ; NO_FWD: sw.bb1: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: sw.bb2: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: sw.bb3: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: sw.bb4: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: return: |
| ; NO_FWD-NEXT: [[RETVAL_0:%.*]] = phi i32 [ 4, [[SW_BB4]] ], [ 3, [[SW_BB3]] ], [ 2, [[SW_BB2]] ], [ 1, [[SW_BB1]] ], [ 0, [[ENTRY:%.*]] ] |
| ; NO_FWD-NEXT: ret i32 [[RETVAL_0]] |
| ; |
| ; FWD-LABEL: @t( |
| ; FWD-NEXT: entry: |
| ; FWD-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[M:%.*]], 4 |
| ; FWD-NEXT: [[M_:%.*]] = select i1 [[SWITCH]], i32 [[M]], i32 4 |
| ; FWD-NEXT: ret i32 [[M_]] |
| ; |
| entry: |
| switch i32 %m, label %sw.bb4 [ |
| i32 0, label %sw.bb0 |
| i32 1, label %sw.bb1 |
| i32 2, label %sw.bb2 |
| i32 3, label %sw.bb3 |
| ] |
| |
| sw.bb0: ; preds = %entry |
| br label %return |
| |
| sw.bb1: ; preds = %entry |
| br label %return |
| |
| sw.bb2: ; preds = %entry |
| br label %return |
| |
| sw.bb3: ; preds = %entry |
| br label %return |
| |
| sw.bb4: ; preds = %entry |
| br label %return |
| |
| return: ; preds = %entry, %sw.bb4, %sw.bb3, %sw.bb2, %sw.bb1 |
| %retval.0 = phi i32 [ 4, %sw.bb4 ], [ 3, %sw.bb3 ], [ 2, %sw.bb2 ], [ 1, %sw.bb1 ], [ 0, %sw.bb0 ] |
| ret i32 %retval.0 |
| } |
| |
| ; If 1 incoming phi value is a case constant of a switch, convert it to the switch condition: |
| ; https://bugs.llvm.org/show_bug.cgi?id=34471 |
| ; This then subsequently should allow squashing of the other trivial case blocks. |
| |
| define i32 @PR34471(i32 %x) { |
| ; NO_FWD-LABEL: @PR34471( |
| ; NO_FWD-NEXT: entry: |
| ; NO_FWD-NEXT: switch i32 [[X:%.*]], label [[ELSE3:%.*]] [ |
| ; NO_FWD-NEXT: i32 17, label [[RETURN:%.*]] |
| ; NO_FWD-NEXT: i32 19, label [[IF19:%.*]] |
| ; NO_FWD-NEXT: i32 42, label [[IF42:%.*]] |
| ; NO_FWD-NEXT: ] |
| ; NO_FWD: if19: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: if42: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: else3: |
| ; NO_FWD-NEXT: br label [[RETURN]] |
| ; NO_FWD: return: |
| ; NO_FWD-NEXT: [[R:%.*]] = phi i32 [ [[X]], [[IF19]] ], [ [[X]], [[IF42]] ], [ 0, [[ELSE3]] ], [ 17, [[ENTRY:%.*]] ] |
| ; NO_FWD-NEXT: ret i32 [[R]] |
| ; |
| ; FWD-LABEL: @PR34471( |
| ; FWD-NEXT: entry: |
| ; FWD-NEXT: switch i32 [[X:%.*]], label [[ELSE3:%.*]] [ |
| ; FWD-NEXT: i32 17, label [[RETURN:%.*]] |
| ; FWD-NEXT: i32 19, label [[RETURN]] |
| ; FWD-NEXT: i32 42, label [[RETURN]] |
| ; FWD-NEXT: ] |
| ; FWD: else3: |
| ; FWD-NEXT: br label [[RETURN]] |
| ; FWD: return: |
| ; FWD-NEXT: [[R:%.*]] = phi i32 [ 0, [[ELSE3]] ], [ [[X]], [[ENTRY:%.*]] ], [ [[X]], [[ENTRY]] ], [ [[X]], [[ENTRY]] ] |
| ; FWD-NEXT: ret i32 [[R]] |
| ; |
| entry: |
| switch i32 %x, label %else3 [ |
| i32 17, label %return |
| i32 19, label %if19 |
| i32 42, label %if42 |
| ] |
| |
| if19: |
| br label %return |
| |
| if42: |
| br label %return |
| |
| else3: |
| br label %return |
| |
| return: |
| %r = phi i32 [ %x, %if19 ], [ %x, %if42 ], [ 0, %else3 ], [ 17, %entry ] |
| ret i32 %r |
| } |
| |