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[PredicateInfo] Add test for multiple branches on same condition (NFC) 

This illustrates a case where RenamedOp does not correspond to the
value used in the condition, which it ideally should.
This commit is contained in:
Nikita Popov 2020-07-10 20:58:09 +02:00
parent e541e1b757
commit a0b5496026
1 changed files with 64 additions and 0 deletions
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64
llvm/test/Transforms/Util/PredicateInfo/branch-on-same-cond.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -print-predicateinfo < %s 2>&1 >/dev/null | FileCheck %s
; FIXME: RenamedOp should be %cmp or %x in all cases here,
; which is the value used in the condition.
define i32 @test(i32 %x) {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK: RenamedOp: [[CMP]]
; CHECK: [[CMP_0:%.*]] = call i1 @llvm.ssa.copy.{{.*}}(i1 [[CMP]])
; CHECK: RenamedOp: [[X]]
; CHECK: [[X_0:%.*]] = call i32 @llvm.ssa.copy.{{.*}}(i32 [[X]])
; CHECK-NEXT: br i1 [[CMP]], label [[BB2:%.*]], label [[EXIT1:%.*]]
; CHECK: bb2:
; CHECK: RenamedOp: [[CMP_0]]
; CHECK: [[CMP_0_1:%.*]] = call i1 @llvm.ssa.copy.{{.*}}(i1 [[CMP_0]])
; CHECK: RenamedOp: [[X]]
; CHECK: [[X_0_1:%.*]] = call i32 @llvm.ssa.copy.{{.*}}(i32 [[X_0]])
; CHECK: RenamedOp: [[X_0]]
; CHECK: [[X_0_4:%.*]] = call i32 @llvm.ssa.copy.{{.*}}(i32 [[X_0]])
; CHECK-NEXT: br i1 [[CMP_0]], label [[BB3:%.*]], label [[EXIT2:%.*]]
; CHECK: bb3:
; CHECK: RenamedOp: [[X]]
; CHECK: [[X_0_1_2:%.*]] = call i32 @llvm.ssa.copy.{{.*}}(i32 [[X_0_1]])
; CHECK: RenamedOp: [[X_0_1]]
; CHECK: [[X_0_1_3:%.*]] = call i32 @llvm.ssa.copy.{{.*}}(i32 [[X_0_1]])
; CHECK-NEXT: br i1 [[CMP_0_1]], label [[EXIT3:%.*]], label [[EXIT4:%.*]]
; CHECK: exit1:
; CHECK-NEXT: ret i32 0
; CHECK: exit2:
; CHECK-NEXT: ret i32 [[X_0_4]]
; CHECK: exit3:
; CHECK-NEXT: ret i32 [[X_0_1_2]]
; CHECK: exit4:
; CHECK-NEXT: ret i32 [[X_0_1_3]]
;
entry:
br label %bb1
bb1:
%cmp = icmp eq i32 %x, 0
br i1 %cmp, label %bb2, label %exit1
bb2:
br i1 %cmp, label %bb3, label %exit2
bb3:
br i1 %cmp, label %exit3, label %exit4
exit1:
ret i32 0
exit2:
ret i32 %x
exit3:
ret i32 %x
exit4:
ret i32 %x
}