; RUN: llc < %s -mtriple=i686--
; PR4753
; This function has a sub-register reuse undone.
@uint8 = external dso_local global i32 ; <ptr> [#uses=3]
declare signext i8 @foo(i32, i8 signext) nounwind readnone
declare signext i8 @bar(i32, i8 signext) nounwind readnone
define i32 @uint80(i8 signext %p_52) nounwind {
entry:
%0 = sext i8 %p_52 to i16 ; <i16> [#uses=1]
%1 = tail call i32 @func_24(i16 zeroext %0, i8 signext ptrtoint (ptr @foo to i8)) nounwind; <i32> [#uses=1]
%2 = trunc i32 %1 to i8 ; <i8> [#uses=1]
%3 = or i8 %2, 1 ; <i8> [#uses=1]
%4 = tail call i32 @safe(i32 1) nounwind ; <i32> [#uses=0]
%5 = tail call i32 @func_24(i16 zeroext 0, i8 signext undef) nounwind; <i32> [#uses=1]
%6 = trunc i32 %5 to i8 ; <i8> [#uses=1]
%7 = xor i8 %3, %p_52 ; <i8> [#uses=1]
%8 = xor i8 %7, %6 ; <i8> [#uses=1]
%9 = icmp ne i8 %p_52, 0 ; <i1> [#uses=1]
%10 = zext i1 %9 to i8 ; <i8> [#uses=1]
%11 = tail call i32 @func_24(i16 zeroext ptrtoint (ptr @bar to i16), i8 signext %10) nounwind; <i32> [#uses=1]
%12 = tail call i32 @func_24(i16 zeroext 0, i8 signext 1) nounwind; <i32> [#uses=0]
br i1 undef, label %bb2, label %bb
bb: ; preds = %entry
br i1 undef, label %bb2, label %bb3
bb2: ; preds = %bb, %entry
br label %bb3
bb3: ; preds = %bb2, %bb
%iftmp.2.0 = phi i32 [ 0, %bb2 ], [ 1, %bb ] ; <i32> [#uses=1]
%13 = icmp ne i32 %11, %iftmp.2.0 ; <i1> [#uses=1]
%14 = tail call i32 @safe(i32 -2) nounwind ; <i32> [#uses=0]
%15 = zext i1 %13 to i8 ; <i8> [#uses=1]
%16 = tail call signext i8 @func_53(i8 signext undef, i8 signext 1, i8 signext %15, i8 signext %8) nounwind; <i8> [#uses=0]
br i1 undef, label %bb5, label %bb4
bb4: ; preds = %bb3
%17 = load volatile i32, ptr @uint8, align 4 ; <i32> [#uses=0]
br label %bb5
bb5: ; preds = %bb4, %bb3
%18 = load volatile i32, ptr @uint8, align 4 ; <i32> [#uses=0]
%19 = sext i8 undef to i16 ; <i16> [#uses=1]
%20 = tail call i32 @func_24(i16 zeroext %19, i8 signext 1) nounwind; <i32> [#uses=0]
br i1 undef, label %return, label %bb6.preheader
bb6.preheader: ; preds = %bb5
%21 = sext i8 %p_52 to i32 ; <i32> [#uses=1]
%22 = load volatile i32, ptr @uint8, align 4 ; <i32> [#uses=0]
%23 = tail call i32 (...) @safefuncts(i32 %21, i32 1) nounwind; <i32> [#uses=0]
unreachable
return: ; preds = %bb5
ret i32 undef
}
declare i32 @func_24(i16 zeroext, i8 signext)
declare i32 @safe(i32)
declare signext i8 @func_53(i8 signext, i8 signext, i8 signext, i8 signext)
declare i32 @safefuncts(...)
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