mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 03:02:36 +01:00
ee79dbb0c4
Later code in TryToSimplifyUncondBranchFromEmptyBlock() assumes that we have cleaned up unreachable blocks, but that was not happening with this switch transform. llvm-svn: 367037
141 lines
3.1 KiB
LLVM
141 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt %s -simplifycfg -S | FileCheck %s
|
|
|
|
declare i32 @f(i32)
|
|
|
|
define i32 @basic(i32 %x) {
|
|
; CHECK-LABEL: @basic(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[DEFAULT:%.*]]
|
|
; CHECK: default:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
|
|
; CHECK-NEXT: ret i32 [[TMP0]]
|
|
; CHECK: a:
|
|
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
|
|
; CHECK-NEXT: ret i32 [[TMP1]]
|
|
;
|
|
|
|
entry:
|
|
switch i32 %x, label %default [
|
|
i32 5, label %a
|
|
i32 6, label %a
|
|
i32 7, label %a
|
|
]
|
|
default:
|
|
%0 = call i32 @f(i32 0)
|
|
ret i32 %0
|
|
a:
|
|
%1 = call i32 @f(i32 1)
|
|
ret i32 %1
|
|
}
|
|
|
|
|
|
define i32 @unreachable(i32 %x) {
|
|
; CHECK-LABEL: @unreachable(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
|
|
; CHECK: a:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
|
|
; CHECK-NEXT: ret i32 [[TMP0]]
|
|
; CHECK: b:
|
|
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
|
|
; CHECK-NEXT: ret i32 [[TMP1]]
|
|
;
|
|
|
|
entry:
|
|
switch i32 %x, label %unreachable [
|
|
i32 5, label %a
|
|
i32 6, label %a
|
|
i32 7, label %a
|
|
i32 10, label %b
|
|
i32 20, label %b
|
|
i32 30, label %b
|
|
i32 40, label %b
|
|
]
|
|
unreachable:
|
|
unreachable
|
|
a:
|
|
%0 = call i32 @f(i32 0)
|
|
ret i32 %0
|
|
b:
|
|
%1 = call i32 @f(i32 1)
|
|
ret i32 %1
|
|
}
|
|
|
|
|
|
define i32 @unreachable2(i32 %x) {
|
|
; CHECK-LABEL: @unreachable2(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
|
|
; CHECK: a:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
|
|
; CHECK-NEXT: ret i32 [[TMP0]]
|
|
; CHECK: b:
|
|
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
|
|
; CHECK-NEXT: ret i32 [[TMP1]]
|
|
;
|
|
|
|
entry:
|
|
; Note: folding the most popular case destination into the default
|
|
; would prevent switch-to-icmp here.
|
|
switch i32 %x, label %unreachable [
|
|
i32 5, label %a
|
|
i32 6, label %a
|
|
i32 7, label %a
|
|
i32 10, label %b
|
|
i32 20, label %b
|
|
]
|
|
unreachable:
|
|
unreachable
|
|
a:
|
|
%0 = call i32 @f(i32 0)
|
|
ret i32 %0
|
|
b:
|
|
%1 = call i32 @f(i32 1)
|
|
ret i32 %1
|
|
}
|
|
|
|
; This would crash because we did not clean up the
|
|
; default block of the switch before removing the switch.
|
|
|
|
define void @PR42737(i32* %a, i1 %c) {
|
|
; CHECK-LABEL: @PR42737(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[C:%.*]], true
|
|
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
|
|
; CHECK-NEXT: unreachable
|
|
;
|
|
entry:
|
|
br i1 %c, label %switch, label %else
|
|
|
|
else:
|
|
store i32 2, i32* %a
|
|
br label %switch
|
|
|
|
switch:
|
|
%cleanup.dest1 = phi i32 [ 0, %else ], [ 3, %entry ]
|
|
switch i32 %cleanup.dest1, label %unreach1 [
|
|
i32 0, label %cleanup1
|
|
i32 3, label %cleanup2
|
|
]
|
|
|
|
cleanup1:
|
|
br label %unreach2
|
|
|
|
cleanup2:
|
|
br label %unreach2
|
|
|
|
unreach1:
|
|
%phi2 = phi i32 [ %cleanup.dest1, %switch ]
|
|
unreachable
|
|
|
|
unreach2:
|
|
unreachable
|
|
}
|