ipra-exact-definition.ll
1.4 KB
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; RUN: llc -mtriple armv7a--none-eabi < %s -enable-ipra | FileCheck %s
; A linkone_odr function (the same applies to available_externally, linkonce,
; weak, common, extern_weak and weak_odr) could be replaced with a
; differently-compiled version of the same source at link time, which might use
; different registers, so we can't do IPRA on it.
define linkonce_odr void @leaf_linkonce_odr() {
entry:
ret void
}
define void @test_linkonce_odr() {
; CHECK-LABEL: test_linkonce_odr:
entry:
; CHECK: ASM1: r3
; CHECK: mov [[TEMP:r[0-9]+]], r3
; CHECK: bl leaf_linkonce_odr
; CHECK: mov r3, [[TEMP]]
; CHECK: ASM2: r3
%0 = tail call i32 asm sideeffect "// ASM1: $0", "={r3},0"(i32 undef)
tail call void @leaf_linkonce_odr()
%1 = tail call i32 asm sideeffect "// ASM2: $0", "={r3},0"(i32 %0)
ret void
}
; This function has external linkage (the same applies to private, internal and
; appending), so the version we see here is guaranteed to be the version
; selected by the linker, so we can do IPRA.
define external void @leaf_external() {
entry:
ret void
}
define void @test_external() {
; CHECK-LABEL: test_external:
entry:
; CHECK: ASM1: r3
; CHECK-NOT: r3
; CHECK: bl leaf_external
; CHECK-NOT: r3
; CHECK: ASM2: r3
%0 = tail call i32 asm sideeffect "// ASM1: $0", "={r3},0"(i32 undef)
tail call void @leaf_external()
%1 = tail call i32 asm sideeffect "// ASM2: $0", "={r3},0"(i32 %0)
ret void
}