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TheRock/compiler/amd-llvm/llvm/test/Transforms/IndVarSimplify/pr60944.ll
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derek.holloway 7502bf64a4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

56 lines
1.8 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -S -passes=indvars < %s | FileCheck %s
@x = global i32 0
; %loop2 is never entered and we cannot derive any fact about %iv from it.
define i32 @main(i32 %iv.start, i32 %arg2) mustprogress {
; CHECK-LABEL: define i32 @main
; CHECK-SAME: (i32 [[IV_START:%.*]], i32 [[ARG2:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ [[IV_START]], [[ENTRY:%.*]] ]
; CHECK-NEXT: br i1 false, label [[LOOP2_PREHEADER:%.*]], label [[LOOP_LATCH]]
; CHECK: loop2.preheader:
; CHECK-NEXT: br label [[LOOP2:%.*]]
; CHECK: loop2:
; CHECK-NEXT: br i1 true, label [[LOOP2_EXIT:%.*]], label [[LOOP2]]
; CHECK: loop2.exit:
; CHECK-NEXT: br label [[LOOP_LATCH]]
; CHECK: loop.latch:
; CHECK-NEXT: [[IV_NEXT]] = sdiv i32 [[ARG2]], [[IV]]
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[IV]], -1
; CHECK-NEXT: br i1 [[CMP2]], label [[LOOP_EXIT:%.*]], label [[LOOP]]
; CHECK: loop.exit:
; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT: ret i32 [[IV_NEXT_LCSSA]]
;
entry:
br label %loop
loop:
%iv = phi i32 [ %iv.next, %loop.latch ], [ %iv.start, %entry ]
br i1 false, label %loop2.preheader, label %loop.latch
loop2.preheader:
br label %loop2
loop2:
%x = load i32, ptr @x, align 4
%cmp1 = icmp ult i32 %iv, %x
br i1 %cmp1, label %loop2.exit, label %loop2
loop2.exit:
br label %loop.latch
loop.latch:
%iv.next = sdiv i32 %arg2, %iv
%cmp2 = icmp eq i32 %iv, -1
br i1 %cmp2, label %loop.exit, label %loop
loop.exit:
%iv.next.lcssa = phi i32 [ %iv.next, %loop.latch ]
ret i32 %iv.next.lcssa
}