mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-04 22:29:22 +00:00
89bb7b5640
Transform br (xor (x, y)) -> br (x != y) Transform br (xor (xor (x,y), 1)) -> br (x == y) Also normalize (and (X, 1) == / != 1 -> (and (X, 1)) != / == 0 to match to "test on x86" and "tst on arm" git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96556 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.3 KiB
LLVM
60 lines
1.3 KiB
LLVM
; An integer truncation to i1 should be done with an and instruction to make
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; sure only the LSBit survives. Test that this is the case both for a returned
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; value and as the operand of a branch.
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; RUN: llc < %s -march=x86 | FileCheck %s
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define i1 @test1(i32 %X) zeroext nounwind {
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%Y = trunc i32 %X to i1
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ret i1 %Y
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}
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; CHECK: test1:
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; CHECK: andl $1, %eax
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define i1 @test2(i32 %val, i32 %mask) nounwind {
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entry:
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%shifted = ashr i32 %val, %mask
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%anded = and i32 %shifted, 1
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%trunced = trunc i32 %anded to i1
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br i1 %trunced, label %ret_true, label %ret_false
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ret_true:
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ret i1 true
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ret_false:
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ret i1 false
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}
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; CHECK: test2:
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; CHECK: btl %eax
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define i32 @test3(i8* %ptr) nounwind {
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%val = load i8* %ptr
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%tmp = trunc i8 %val to i1
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br i1 %tmp, label %cond_true, label %cond_false
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cond_true:
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ret i32 21
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cond_false:
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ret i32 42
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}
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; CHECK: test3:
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; CHECK: testb $1, (%eax)
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define i32 @test4(i8* %ptr) nounwind {
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%tmp = ptrtoint i8* %ptr to i1
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br i1 %tmp, label %cond_true, label %cond_false
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cond_true:
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ret i32 21
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cond_false:
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ret i32 42
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}
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; CHECK: test4:
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; CHECK: testb $1, 4(%esp)
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define i32 @test5(double %d) nounwind {
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%tmp = fptosi double %d to i1
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br i1 %tmp, label %cond_true, label %cond_false
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cond_true:
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ret i32 21
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cond_false:
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ret i32 42
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}
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; CHECK: test5:
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; CHECK: testb $1
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