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99ca015392
Teach LLVM optimize to more precisely in the presence of "deopt" operand bundles. "deopt" operand bundles imply that the call they're attached to is at least `readonly` (i.e. they don't imply clobber semantics), and they don't capture their bundle operands. llvm-svn: 254118
90 lines
2.1 KiB
LLVM
90 lines
2.1 KiB
LLVM
; RUN: opt -S -early-cse < %s | FileCheck %s
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; While it is normally okay to do memory optimizations over calls to
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; @readonly_function and @readnone_function, we cannot do that if
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; they're carrying unknown operand bundles since the presence of
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; unknown operand bundles implies arbitrary memory effects.
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declare void @readonly_function() readonly nounwind
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declare void @readnone_function() readnone nounwind
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define i32 @test0(i32* %x) {
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; CHECK-LABEL: @test0(
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entry:
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store i32 100, i32* %x
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; CHECK: store i32 100, i32* %x
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call void @readonly_function() [ "tag"() ]
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; CHECK: call void @readonly_function()
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%v = load i32, i32* %x
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; CHECK: %v = load i32, i32* %x
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; CHECK: ret i32 %v
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ret i32 %v
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}
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define i32 @test1(i32* %x) {
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; CHECK: @test1(
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entry:
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store i32 100, i32* %x
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; CHECK: store i32 100, i32* %x
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call void @readonly_function() readonly [ "tag"() ]
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; CHECK-NOT: call void @readonly_function
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%v = load i32, i32* %x
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ret i32 %v
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; CHECK: ret i32 100
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}
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define i32 @test3(i32* %x) {
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; CHECK-LABEL: @test3(
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entry:
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store i32 100, i32* %x
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; CHECK: store i32 100, i32* %x
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call void @readonly_function()
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; CHECK-NOT: call void @readonly_function
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%v = load i32, i32* %x
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ret i32 %v
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; CHECK: ret i32 100
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}
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define void @test4(i32* %x) {
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; CHECK-LABEL: @test4(
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entry:
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store i32 100, i32* %x
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; CHECK: store i32 100, i32* %x
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call void @readnone_function() [ "tag"() ]
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; CHECK: call void @readnone_function
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store i32 200, i32* %x
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; CHECK: store i32 200, i32* %x
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ret void
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}
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define void @test5(i32* %x) {
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; CHECK-LABEL: @test5(
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entry:
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store i32 100, i32* %x
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; CHECK-NOT: store i32 100, i32* %x
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; CHECK-NOT: call void @readnone_function
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call void @readnone_function() readnone [ "tag"() ]
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store i32 200, i32* %x
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; CHECK: store i32 200, i32* %x
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ret void
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}
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define void @test6(i32* %x) {
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; The "deopt" operand bundle does not make the call to
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; @readonly_function read-write; and so the nounwind readonly call can
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; be deleted.
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; CHECK-LABEL: @test6(
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entry:
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 200, i32* %x
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; CHECK-NEXT: ret void
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store i32 100, i32* %x
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call void @readonly_function() [ "deopt"() ]
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store i32 200, i32* %x
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ret void
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}
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