7def86bbdb
Add pointers to the list of allowed types, but don't try to promote them. Also fixed a bug with the promotion of undef values, so a new value is now created instead of mutating in place. We also now only promote if there's an instruction in the use-def chains other than the icmp, sinks and sources. Differential Revision: https://reviews.llvm.org/D50054 llvm-svn: 339754
85 lines
2.3 KiB
LLVM
85 lines
2.3 KiB
LLVM
; RUN: llc -mtriple=thumbv8 -arm-disable-cgp=false %s -o - | FileCheck %s
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; RUN: llc -mtriple=armv8 -arm-disable-cgp=false %s -o - | FileCheck %s
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; CHECK-LABEL: phi_pointers
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; CHECK-NOT: uxt
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define void @phi_pointers(i16* %a, i16* %b, i8 zeroext %M, i8 zeroext %N) {
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entry:
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%add = add nuw i8 %M, 1
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%and = and i8 %add, 1
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%cmp = icmp ugt i8 %add, %N
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%base = select i1 %cmp, i16* %a, i16* %b
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%other = select i1 %cmp, i16* %b, i16* %b
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br label %loop
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loop:
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%ptr = phi i16* [ %base, %entry ], [ %gep, %loop ]
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%idx = phi i8 [ %and, %entry ], [ %inc, %loop ]
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%load = load i16, i16* %ptr, align 2
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%inc = add nuw nsw i8 %idx, 1
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%gep = getelementptr inbounds i16, i16* %ptr, i8 %inc
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%cond = icmp eq i16* %gep, %other
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br i1 %cond, label %exit, label %loop
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exit:
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ret void
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}
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; CHECK-LABEL: phi_pointers_null
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; CHECK-NOT: uxt
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define void @phi_pointers_null(i16* %a, i16* %b, i8 zeroext %M, i8 zeroext %N) {
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entry:
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%add = add nuw i8 %M, 1
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%and = and i8 %add, 1
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%cmp = icmp ugt i8 %add, %N
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%base = select i1 %cmp, i16* %a, i16* %b
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%other = select i1 %cmp, i16* %b, i16* %b
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%cmp.1 = icmp eq i16* %base, %other
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br i1 %cmp.1, label %fail, label %loop
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fail:
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br label %loop
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loop:
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%ptr = phi i16* [ %base, %entry ], [ null, %fail ], [ %gep, %if.then ]
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%idx = phi i8 [ %and, %entry ], [ 0, %fail ], [ %inc, %if.then ]
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%undef = icmp eq i16* %ptr, undef
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br i1 %undef, label %exit, label %if.then
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if.then:
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%load = load i16, i16* %ptr, align 2
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%inc = add nuw nsw i8 %idx, 1
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%gep = getelementptr inbounds i16, i16* %ptr, i8 %inc
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%cond = icmp eq i16* %gep, %other
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br i1 %cond, label %exit, label %loop
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exit:
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ret void
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}
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declare i8 @do_something_with_ptr(i8, i16*)
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; CHECK-LABEL: call_pointer
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; CHECK-NOT: uxt
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define i8 @call_pointer(i8 zeroext %x, i8 zeroext %y, i16* %a, i16* %b) {
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%or = or i8 %x, %y
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%shr = lshr i8 %or, 1
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%add = add nuw i8 %shr, 2
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%cmp = icmp ne i8 %add, 0
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%ptr = select i1 %cmp, i16* %a, i16* %b
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%call = tail call zeroext i8 @do_something_with_ptr(i8 %shr, i16* %ptr)
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ret i8 %call
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}
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; CHECK-LABEL: pointer_to_pointer
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; CHECK-NOT: uxt
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define i16 @pointer_to_pointer(i16** %arg, i16 zeroext %limit) {
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entry:
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%addr = load i16*, i16** %arg
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%val = load i16, i16* %addr
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%add = add nuw i16 %val, 7
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%cmp = icmp ult i16 %add, 256
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%res = select i1 %cmp, i16 128, i16 255
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ret i16 %res
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}
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