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TheRock/compiler/amd-llvm/llvm/test/Transforms/LICM/preheader-safe.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -S -passes=licm < %s | FileCheck %s
declare void @use_nothrow(i64 %a) nounwind
declare void @use(i64 %a)
declare void @maythrow()
define void @nothrow(i64 %x, i64 %y, ptr %cond) {
; CHECK-LABEL: define void @nothrow(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], ptr [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: br label %[[LOOP2:.*]]
; CHECK: [[LOOP2]]:
; CHECK-NEXT: call void @use_nothrow(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%div = udiv i64 %x, %y
br label %loop2
loop2:
call void @use_nothrow(i64 %div)
br label %loop
}
; The udiv is guarantee to execute if the loop is
define void @throw_header_after(i64 %x, i64 %y, ptr %cond) {
; CHECK-LABEL: define void @throw_header_after(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], ptr [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: call void @use(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%div = udiv i64 %x, %y
call void @use(i64 %div)
br label %loop
}
define void @throw_header_after_rec(ptr %xp, ptr %yp, ptr %cond) {
; CHECK-LABEL: define void @throw_header_after_rec(
; CHECK-SAME: ptr [[XP:%.*]], ptr [[YP:%.*]], ptr [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[XP]], align 4
; CHECK-NEXT: [[Y:%.*]] = load i64, ptr [[YP]], align 4
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: call void @use(i64 [[DIV]]) #[[ATTR1:[0-9]+]]
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%x = load i64, ptr %xp
%y = load i64, ptr %yp
%div = udiv i64 %x, %y
call void @use(i64 %div) readonly
br label %loop
}
; Similiar to the above, but the hoistable instruction (%y in this case)
; happens not to be the first instruction in the block.
define void @throw_header_after_nonfirst(ptr %xp, ptr %yp, ptr %cond) {
; CHECK-LABEL: define void @throw_header_after_nonfirst(
; CHECK-SAME: ptr [[XP:%.*]], ptr [[YP:%.*]], ptr [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[Y:%.*]] = load i64, ptr [[YP]], align 4
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[DIV:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i64, ptr [[XP]], i64 [[IV]]
; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT: [[DIV]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: call void @use(i64 [[DIV]]) #[[ATTR1]]
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%iv = phi i64 [0, %entry], [%div, %loop]
%gep = getelementptr i64, ptr %xp, i64 %iv
%x = load i64, ptr %gep
%y = load i64, ptr %yp
%div = udiv i64 %x, %y
call void @use(i64 %div) readonly
br label %loop
}
; Negative test
define void @throw_header_before(i64 %x, i64 %y, ptr %cond) {
; CHECK-LABEL: define void @throw_header_before(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], ptr [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: call void @maythrow()
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: call void @use(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
call void @maythrow()
%div = udiv i64 %x, %y
call void @use(i64 %div)
br label %loop
}
; The header is known no throw, but the loop is not. We can
; still lift out of the header.
define void @nothrow_header(i64 %x, i64 %y, i1 %cond) {
; CHECK-LABEL: define void @nothrow_header(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: br i1 [[COND]], label %[[LOOP_IF:.*]], label %[[EXIT:.*]]
; CHECK: [[LOOP_IF]]:
; CHECK-NEXT: call void @use(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%div = udiv i64 %x, %y
br i1 %cond, label %loop-if, label %exit
loop-if:
call void @use(i64 %div)
br label %loop
exit:
ret void
}
; Positive test - can hoist something that happens before thrower.
define void @nothrow_header_pos(i64 %x, i64 %y, i1 %cond) {
; CHECK-LABEL: define void @nothrow_header_pos(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: br label %[[LOOP_IF:.*]]
; CHECK: [[LOOP_IF]]:
; CHECK-NEXT: call void @use(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
br label %loop-if
loop-if:
%div = udiv i64 %x, %y
call void @use(i64 %div)
br label %loop
}
; Negative test - can't move out of throwing block
define void @nothrow_header_neg(i64 %x, i64 %y, i1 %cond) {
; CHECK-LABEL: define void @nothrow_header_neg(
; CHECK-SAME: i64 [[X:%.*]], i64 [[Y:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: br label %[[LOOP_IF:.*]]
; CHECK: [[LOOP_IF]]:
; CHECK-NEXT: call void @maythrow()
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], [[Y]]
; CHECK-NEXT: call void @use(i64 [[DIV]])
; CHECK-NEXT: br label %[[LOOP]]
;
entry:
br label %loop
loop: ; preds = %entry, %for.inc
br label %loop-if
loop-if:
call void @maythrow()
%div = udiv i64 %x, %y
call void @use(i64 %div)
br label %loop
}
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