285 lines
8.3 KiB
LLVM
285 lines
8.3 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -basic-aa -dse -S %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; Test case for PR16520. The store in %if.then is dead, because the same value
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; has been stored earlier to the same location.
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define void @test1_pr16520(i1 %b, i8* nocapture %r) {
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; CHECK-LABEL: @test1_pr16520(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
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; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: store i8 1, i8* [[R]], align 1
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; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[IF_END:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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entry:
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store i8 1, i8* %r, align 1
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br i1 %b, label %if.then, label %if.else
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if.then: ; preds = %entry
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store i8 1, i8* %r, align 1
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tail call void @fn_mayread_or_clobber()
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br label %if.end
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if.else: ; preds = %entry
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tail call void @fn_mayread_or_clobber()
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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ret void
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}
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declare void @fn_mayread_or_clobber()
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declare void @fn_readonly() readonly
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define void @test2(i1 %b, i8* nocapture %r) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
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; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @fn_readonly()
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; CHECK-NEXT: br label [[IF_END:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: tail call void @fn_readonly()
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: store i8 1, i8* [[R]], align 1
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; CHECK-NEXT: ret void
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;
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entry:
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store i8 1, i8* %r, align 1
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br i1 %b, label %if.then, label %if.else
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if.then: ; preds = %entry
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tail call void @fn_readonly()
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br label %if.end
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if.else: ; preds = %entry
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tail call void @fn_readonly()
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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store i8 1, i8* %r, align 1
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ret void
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}
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define void @test3(i1 %b, i8* nocapture %r) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
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; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[IF_END:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: tail call void @fn_readonly()
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: store i8 1, i8* [[R]], align 1
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; CHECK-NEXT: ret void
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;
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entry:
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store i8 1, i8* %r, align 1
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br i1 %b, label %if.then, label %if.else
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if.then: ; preds = %entry
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tail call void @fn_mayread_or_clobber()
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br label %if.end
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if.else: ; preds = %entry
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tail call void @fn_readonly()
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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store i8 1, i8* %r, align 1
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ret void
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}
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define void @test4(i1 %b, i8* nocapture %r) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
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; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @fn_readonly()
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; CHECK-NEXT: br label [[IF_END:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: store i8 1, i8* [[R]], align 1
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; CHECK-NEXT: ret void
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;
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entry:
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store i8 1, i8* %r, align 1
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br i1 %b, label %if.then, label %if.else
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if.then: ; preds = %entry
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tail call void @fn_readonly()
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br label %if.end
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if.else: ; preds = %entry
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tail call void @fn_mayread_or_clobber()
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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store i8 1, i8* %r, align 1
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ret void
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}
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define void @test5(i1 %b, i8* nocapture %r) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
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; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @fn_readonly()
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; CHECK-NEXT: br label [[IF_END:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: store i8 1, i8* [[R]], align 1
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; CHECK-NEXT: ret void
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;
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entry:
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store i8 1, i8* %r, align 1
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br i1 %b, label %if.then, label %if.else
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if.then: ; preds = %entry
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tail call void @fn_readonly()
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br label %if.end
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if.else: ; preds = %entry
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tail call void @fn_mayread_or_clobber()
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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store i8 1, i8* %r, align 1
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ret void
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}
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declare i1 @cond() readnone
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define void @test6(i32* noalias %P) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
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; CHECK: for.header:
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
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; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: store i32 1, i32* [[P]], align 4
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; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
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; CHECK-NEXT: br label [[FOR_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: store i32 3, i32* [[P]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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br label %for.header
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for.header:
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store i32 1, i32* %P, align 4
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%c1 = call i1 @cond()
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br i1 %c1, label %for.body, label %end
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for.body:
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store i32 1, i32* %P, align 4
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%lv = load i32, i32* %P
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br label %for.header
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end:
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store i32 3, i32* %P, align 4
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ret void
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}
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; Make sure the store in %bb3 can be eliminated in the presences of early returns.
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define void @test7(i32* noalias %P) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: ret void
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; CHECK: bb3:
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; CHECK-NEXT: store i32 0, i32* [[P]], align 4
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; CHECK-NEXT: ret void
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;
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store i32 0, i32* %P
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br i1 true, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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ret void
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bb3:
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store i32 0, i32* %P
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ret void
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}
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; Make sure the store in %bb3 won't be eliminated because it may be clobbered before.
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define void @test8(i32* noalias %P) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: call void @fn_mayread_or_clobber()
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: ret void
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; CHECK: bb3:
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; CHECK-NEXT: store i32 0, i32* [[P]], align 4
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; CHECK-NEXT: ret void
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;
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store i32 0, i32* %P
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br i1 true, label %bb1, label %bb2
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bb1:
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call void @fn_mayread_or_clobber()
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br label %bb3
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bb2:
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ret void
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bb3:
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store i32 0, i32* %P
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ret void
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}
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; Make sure the store in %bb3 will be eliminated because only the early exit path
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; may be clobbered.
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define void @test9(i32* noalias %P) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: call void @fn_mayread_or_clobber()
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; CHECK-NEXT: ret void
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; CHECK: bb3:
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; CHECK-NEXT: store i32 0, i32* [[P]], align 4
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; CHECK-NEXT: ret void
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;
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store i32 0, i32* %P
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br i1 true, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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call void @fn_mayread_or_clobber()
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ret void
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bb3:
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store i32 0, i32* %P
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ret void
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}
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