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TheRock/compiler/amd-llvm/llvm/test/CodeGen/WebAssembly/fast-isel-br-i1.ll
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derek.holloway 7502bf64a4
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48 lines
1.2 KiB
LLVM

; RUN: llc < %s -fast-isel -asm-verbose=false -wasm-keep-registers | FileCheck %s
target triple = "wasm32-unknown-unknown"
; Fast-isel uses a 32-bit xor with -1 to negate i1 values, because it doesn't
; make any guarantees about the contents of the high bits of a register holding
; an i1 value. Test that when we do a `br_if` or `br_unless` with what what an
; i1 value in LLVM IR, that we only test the low bit.
; CHECK: i32.xor
; CHECK: i32.const $push[[L0:[0-9]+]]=, 1{{$}}
; CHECK: i32.and $push[[L1:[0-9]+]]=, $pop{{[0-9]+}}, $pop[[L0]]{{$}}
; CHECK: br_if 0, $pop[[L1]]{{$}}
; CHECK: i32.xor
; CHECK: i32.const $push[[L2:[0-9]+]]=, 1{{$}}
; CHECK: i32.and $push[[L3:[0-9]+]]=, $pop{{[0-9]+}}, $pop[[L2]]{{$}}
; CHECK: br_if 0, $pop[[L3]]{{$}}
define void @test() {
start:
%0 = call i32 @return_one()
br label %bb1
bb1:
%1 = icmp eq i32 %0, 1
%2 = xor i1 %1, true
br i1 %2, label %bb2, label %bb3
bb2:
call void @panic()
unreachable
bb3:
%3 = xor i1 %2, true
br i1 %3, label %bb4, label %bb5
bb4:
call void @panic()
unreachable
bb5:
ret void
}
declare i32 @return_one()
declare void @panic()