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https://github.com/c64scene-ar/llvm-6502.git
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cf45151b2c
This fix checks first if the instruction to be folded (e.g. sign-/zero-extend, or shift) is in the same machine basic block as the instruction we are folding into. Not doing so can result in incorrect code, because the value might not be live-out of the basic block, where the value is defined. This fixes rdar://problem/18169495. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216700 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.1 KiB
LLVM
55 lines
1.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-apple-darwin -O0 -fast-isel-abort -verify-machineinstrs < %s
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; Test that we don't fold the shift.
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define i64 @fold_shift_test(i64 %a, i1 %c) {
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%1 = sub i64 %a, 8
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%2 = ashr i64 %1, 3
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br i1 %c, label %bb1, label %bb2
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bb1:
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%3 = icmp ult i64 0, %2
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br i1 %3, label %bb2, label %bb3
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bb2:
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ret i64 1
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bb3:
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ret i64 2
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}
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; Test that we don't fold the sign-extend.
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define i64 @fold_sext_test1(i32 %a, i1 %c) {
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%1 = sub i32 %a, 8
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%2 = sext i32 %1 to i64
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br i1 %c, label %bb1, label %bb2
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bb1:
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%3 = icmp ult i64 0, %2
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br i1 %3, label %bb2, label %bb3
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bb2:
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ret i64 1
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bb3:
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ret i64 2
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}
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; Test that we don't fold the sign-extend.
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define i64 @fold_sext_test2(i32 %a, i1 %c) {
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%1 = sub i32 %a, 8
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%2 = sext i32 %1 to i64
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br i1 %c, label %bb1, label %bb2
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bb1:
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%3 = shl i64 %2, 4
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ret i64 %3
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bb2:
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ret i64 %2
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}
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; Test that we clear the kill flag.
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define i32 @fold_kill_test(i32 %a) {
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%1 = sub i32 %a, 8
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%2 = shl i32 %1, 3
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%3 = icmp ult i32 0, %2
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br i1 %3, label %bb1, label %bb2
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bb1:
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ret i32 %2
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bb2:
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%4 = add i32 %2, 4
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ret i32 %4
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}
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