e422c0d3b2
The initial land incorrectly optimized forwarding non-Constants in non-nosync/norecurse functions. Bail on non-Constants since norecurse should cause global -> alloca promotion anyway. The initial land also incorrectly assumed that StoredOnceStore was the only store to the global, but it actually means that only one value other than the global initializer is stored. Add a check that there's only one store. Compile time tracker: https://llvm-compile-time-tracker.com/compare.php?from=c80b88ee29f34078d2149de94e27600093e6c7c0&to=ef2c2b7772424b6861a75e794f3c31b45167304a&stat=instructions Reviewed By: nikic, asbirlea, jdoerfert Differential Revision: https://reviews.llvm.org/D128128
137 lines
3.4 KiB
LLVM
137 lines
3.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=globalopt -S < %s | FileCheck %s
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@g1 = internal unnamed_addr global i32 0
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@g2 = internal unnamed_addr global i32 0
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@g3 = internal unnamed_addr global i32 0
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@g4 = internal unnamed_addr global i32 0
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@g5 = internal unnamed_addr global i32 0
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@g6 = internal unnamed_addr global i32 0
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@g7 = internal unnamed_addr global i32 0
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@g8 = internal unnamed_addr global ptr null
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@tl = internal thread_local unnamed_addr global i32 0
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declare void @b()
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define i1 @dom_const() {
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; CHECK-LABEL: @dom_const(
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: ret i1 true
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;
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store i1 true, ptr @g1
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call void @b()
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%r = load i1, ptr @g1
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ret i1 %r
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}
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define i32 @dom_arg(i32 %a) {
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; CHECK-LABEL: @dom_arg(
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; CHECK-NEXT: store i32 [[A:%.*]], ptr @g2, align 4
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load i32, ptr @g2, align 4
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; CHECK-NEXT: ret i32 [[R]]
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;
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store i32 %a, ptr @g2
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call void @b()
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%r = load i32, ptr @g2
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ret i32 %r
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}
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define ptr @dom_thread_local_global() {
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; CHECK-LABEL: @dom_thread_local_global(
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; CHECK-NEXT: store ptr @tl, ptr @g3, align 8
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load ptr, ptr @g3, align 8
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; CHECK-NEXT: ret ptr [[R]]
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;
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store ptr @tl, ptr @g3
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call void @b()
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%r = load ptr, ptr @g3
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ret ptr %r
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}
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define i32 @dom_different_types() {
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; CHECK-LABEL: @dom_different_types(
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; CHECK-NEXT: store i1 true, ptr @g4, align 1
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load i32, ptr @g4, align 4
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; CHECK-NEXT: ret i32 [[R]]
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;
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store i1 true, ptr @g4
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call void @b()
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%r = load i32, ptr @g4
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ret i32 %r
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}
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define i1 @no_dom(i1 %i) {
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; CHECK-LABEL: @no_dom(
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; CHECK-NEXT: br i1 [[I:%.*]], label [[BB1:%.*]], label [[END:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: store i1 true, ptr @g5, align 1
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load i1, ptr @g5, align 1
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; CHECK-NEXT: ret i1 [[R]]
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;
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br i1 %i, label %bb1, label %end
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bb1:
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store i1 true, ptr @g5
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br label %end
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end:
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call void @b()
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%r = load i1, ptr @g5
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ret i1 %r
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}
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define i1 @dom_multiple_function_loads() {
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; CHECK-LABEL: @dom_multiple_function_loads(
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; CHECK-NEXT: store i1 true, ptr @g6, align 1
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: ret i1 true
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;
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store i1 true, ptr @g6
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call void @b()
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%r = load i1, ptr @g6
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ret i1 %r
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}
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define i1 @other() {
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; CHECK-LABEL: @other(
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load i1, ptr @g6, align 1
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; CHECK-NEXT: ret i1 [[R]]
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;
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call void @b()
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%r = load i1, ptr @g6
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ret i1 %r
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}
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define i1 @dom_volatile() {
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; CHECK-LABEL: @dom_volatile(
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; CHECK-NEXT: store i1 true, ptr @g7, align 1
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load volatile i1, ptr @g7, align 1
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; CHECK-NEXT: ret i1 [[R]]
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;
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store i1 true, ptr @g7
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call void @b()
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%r = load volatile i1, ptr @g7
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ret i1 %r
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}
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define i1 @dom_store_const_and_initializer() {
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; CHECK-LABEL: @dom_store_const_and_initializer(
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; CHECK-NEXT: store i1 true, ptr @g8, align 1
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; CHECK-NEXT: store i1 false, ptr @g8, align 1
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; CHECK-NEXT: call void @b()
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; CHECK-NEXT: [[R:%.*]] = load i1, ptr @g8, align 1
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; CHECK-NEXT: ret i1 [[R]]
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;
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store i1 true, ptr @g8
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store i1 false, ptr @g8
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call void @b()
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%r = load i1, ptr @g8
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ret i1 %r
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}
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